Merge pull request #33 from f-koehler/renovate/actions-checkout-5.x

Update actions/checkout action to v5

Author: f-koehler

.github/workflows/docker.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       # Install the cosign tool except on PR
       # https://github.com/sigstore/cosign-installer