Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx

.github/workflows/docker.yml

@@ -34,7 +34,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
 
       - name: Docker build
         run: |