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

Author: renovate[bot]

.github/workflows/docker.yml

@@ -22,7 +22,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
 
             - name: Login to ${{ env.DOCKER_REGISTRY }}
               uses: docker/login-action@v3