Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...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] <[email protected]>

Author: dependabot[bot]

.github/workflows/codeql.yml

@@ -33,7 +33,7 @@ jobs:
           build-mode: none
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         submodules: 'recursive'
 

.github/workflows/docker-image.yaml

@@ -28,7 +28,7 @@ jobs:
           GHCR_REPOSITORY="${{ github.repository_owner }}"
           echo "REPOSITORY=${GHCR_REPOSITORY,,}" >> ${GITHUB_ENV}
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           submodules: "recursive"
 

.github/workflows/tests.yaml

@@ -53,7 +53,7 @@ jobs:
     runs-on: ${{ matrix.runner }}
     continue-on-error: ${{ matrix.continue-on-error == true }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build ${{ matrix.name }}
         env:
           DOCKER_REGISTRY: docker.pkg.github.com

.github/workflows/update-docs.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Trigger remote workflow to update docs
         run: |
           repo_owner="GothenburgBitFactory"