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](https://github.com/actions/checkout/compare/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>

.github/workflows/release.yaml

@@ -11,7 +11,7 @@ jobs:
     environment: release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Check if tag already exists
         # note: this will fail if the tag already exists
@@ -84,7 +84,7 @@ jobs:
       # for pushing container images
       packages: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/validations.yaml

@@ -12,7 +12,7 @@ jobs:
     name: "Static analysis"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
@@ -32,7 +32,7 @@ jobs:
 
     runs-on: ${{ matrix.platform }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap
@@ -44,7 +44,7 @@ jobs:
     name: "Build snapshot artifacts"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Bootstrap environment
         uses: ./.github/actions/bootstrap