chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/dockerpublish.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Run tests
         run: |
@@ -49,7 +49,7 @@ jobs:
     if: github.event_name == 'push'
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Build image
         run: docker build . --file Dockerfile --build-arg VER_APTLY=${{ env.VER_APTLY }} --tag image