Bump docker/build-push-action from 4 to 5 (#41)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4 to 5.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v4...v5)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/publish-containers.yml

@@ -39,7 +39,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build / push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           context: backend
           file: ./backend/Dockerfile
@@ -79,7 +79,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build / push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: ./Dockerfile