chore(deps): bump actions/checkout from 4 to 6 (#249)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Robin Bürgi <code-inflation@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Ensure 'cargo fmt'
       run: cargo fmt -- --check
     - name: Build
@@ -33,7 +33,7 @@ jobs:
   docker-build-amd64:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Build AMD64 Docker image
@@ -48,7 +48,7 @@ jobs:
   docker-build-arm64:
     runs-on: ubuntu-24.04-arm
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Build ARM64 Docker image
         run: docker build --platform linux/arm64 -t cybuerg/cfspeedtest:${{ github.sha }}-arm64 .
 

.github/workflows/pre-commit.yml

@@ -12,6 +12,6 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v5
     - uses: pre-commit/action@v3.0.1

.github/workflows/release.yaml

@@ -12,7 +12,7 @@ jobs:
   create-release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: taiki-e/create-gh-release-action@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -36,7 +36,7 @@ jobs:
             os: macos-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: taiki-e/upload-rust-binary-action@v1
         with:
           bin: cfspeedtest
@@ -49,7 +49,7 @@ jobs:
     needs: [create-release, upload-assets]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Log in to DockerHub
@@ -71,7 +71,7 @@ jobs:
     needs: [create-release, upload-assets]
     runs-on: ubuntu-24.04-arm
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Log in to DockerHub
         uses: docker/login-action@v3
         with:

.github/workflows/rust-clippy.yml

@@ -17,6 +17,6 @@ jobs:
   clippy_check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Run Clippy
         run: cargo clippy --all-targets --all-features

.github/workflows/security-checks.yml

@@ -14,7 +14,7 @@ jobs:
   cargo_audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Cache cargo-audit
         uses: actions/cache@v4
         with: