build(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/cd.yml

@@ -27,7 +27,7 @@ jobs:
     outputs:
       changed: ${{ steps.check.outputs.changed }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Check for changes and avoid spamming
@@ -140,7 +140,7 @@ jobs:
       group: "pages"
       cancel-in-progress: false
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
             lfs: true
       - name: Find CI build artifact for current source
@@ -208,7 +208,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up JDK 17

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     outputs:
       is-rebased: ${{ steps.check.outputs.is-rebased }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Check if branch is rebased
@@ -41,7 +41,7 @@ jobs:
     outputs:
       outcome: ${{ steps.check.outcome }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt
@@ -59,7 +59,7 @@ jobs:
       warnings: ${{ steps.count.outputs.warnings }}
       details: ${{ steps.count.outputs.details }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy
@@ -88,7 +88,7 @@ jobs:
       duration: ${{ steps.summarize.outputs.duration }}
       failures: ${{ steps.summarize.outputs.failures }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: llvm-tools-preview
@@ -127,7 +127,7 @@ jobs:
     if: always() && needs.unit-tests.result == 'success'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download lcov report
         uses: actions/download-artifact@v4
         with:
@@ -146,7 +146,7 @@ jobs:
       duration: ${{ steps.summarize.outputs.duration }}
       screenshots: ${{ steps.cloudinary.outputs.screenshots }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with:
@@ -256,7 +256,7 @@ jobs:
       duration: ${{ steps.build.outputs.duration }}
       lighthouse_results: ${{ steps.lighthouse.outputs.manifest }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           lfs: true
       - uses: dtolnay/rust-toolchain@stable
@@ -299,7 +299,7 @@ jobs:
       contents: read
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download lcov report
         continue-on-error: true
         uses: actions/download-artifact@v4
@@ -448,7 +448,7 @@ jobs:
       contents: read
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download lcov report
         continue-on-error: true
         uses: actions/download-artifact@v4

.github/workflows/copilot-setup-steps.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install System Dependencies
         run: |

.github/workflows/nightly.yml

@@ -13,7 +13,7 @@ jobs:
     name: Dependency Audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: EmbarkStudios/cargo-deny-action@v2
         with:
           command: check
@@ -22,7 +22,7 @@ jobs:
     name: Mutation Testing
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: swatinem/rust-cache@v2
       - name: Install cargo-mutants
@@ -49,7 +49,7 @@ jobs:
       contents: read
       issues: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Summarize Results
         uses: actions/github-script@v7
         with: