chore(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/benchmark.yml

@@ -14,7 +14,7 @@ jobs:
     name: "Benchmark 001 — Gateway Cycle Latency"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Python 3.11
         uses: actions/setup-python@v5
@@ -77,7 +77,7 @@ jobs:
     name: "Benchmark 002 — Fleet Scalability"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Python 3.11
         uses: actions/setup-python@v5
@@ -133,7 +133,7 @@ jobs:
     name: "Interop — Driver Contract Tests (SimulatorDriver)"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Python 3.11
         uses: actions/setup-python@v5

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     name: Lint (ruff)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -45,7 +45,7 @@ jobs:
     name: Type check (mypy)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -65,7 +65,7 @@ jobs:
     name: Tests (pytest)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -100,7 +100,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [test]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -134,7 +134,7 @@ jobs:
     name: Security (bandit + pip-audit)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -187,7 +187,7 @@ jobs:
     name: Terraform validate
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Terraform
         uses: hashicorp/setup-terraform@v3
@@ -210,7 +210,7 @@ jobs:
     name: Helm lint & template
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Helm
         uses: azure/setup-helm@v4
@@ -237,7 +237,7 @@ jobs:
     outputs:
       image-digest: ${{ steps.build.outputs.digest }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -264,7 +264,7 @@ jobs:
     permissions:
       security-events: write  # Required to upload SARIF to GitHub Security tab
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -309,7 +309,7 @@ jobs:
       id-token: write  # Required for Workload Identity Federation
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Authenticate to Google Cloud
         uses: google-github-actions/auth@v2

.github/workflows/compliance-report.yml

@@ -22,7 +22,7 @@ jobs:
     name: "SAST — Bandit (Python)"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -47,7 +47,7 @@ jobs:
     name: "SCA — Trivy (dependencies + Docker)"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Scan Python dependencies
         uses: aquasecurity/trivy-action@master
@@ -70,7 +70,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name == 'push' || github.event_name == 'schedule'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
 
@@ -92,7 +92,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: [bandit-sast, trivy-scan]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:

.github/workflows/deps-audit.yml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -95,7 +95,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Python
         uses: actions/setup-python@v5

.github/workflows/docker-multiarch.yml

@@ -30,7 +30,7 @@ jobs:
         platform: [linux/amd64, linux/arm64]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: docker/setup-qemu-action@v3
       - uses: docker/setup-buildx-action@v3
 

.github/workflows/docs.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Full history for git-revision-date-localized
 
@@ -65,7 +65,7 @@ jobs:
     if: github.ref == 'refs/heads/main' && github.event_name == 'push'
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/fuzzing.yml

@@ -30,7 +30,7 @@ jobs:
       security-events: write   # Upload SARIF findings
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:

.github/workflows/mutation-test.yml

@@ -16,7 +16,7 @@ jobs:
     timeout-minutes: 60
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:

.github/workflows/pypi.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Full history for release notes
 
@@ -67,7 +67,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-python@v5
         with:
@@ -137,7 +137,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0