chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -15,7 +15,7 @@ jobs:
     name: Publish Docker Image to GitHub Packages
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Build image
         run: docker build . --file Dockerfile --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"