build(deps): bump docker/build-push-action from 4 to 5

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](docker/build-push-action@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] <[email protected]>

.github/workflows/release.yaml

@@ -20,7 +20,7 @@ jobs:
           password: ${{secrets.GITHUB_TOKEN}}
       -
         name: Build and push kbs (With built-in CoCo AS)
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: ./docker/Dockerfile
@@ -29,7 +29,7 @@ jobs:
           tags: ghcr.io/confidential-containers/key-broker-service:built-in-as-${{ github.ref_name }}
       -
         name: Build and push kbs (With the CoCo gRPC AS)
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: ./docker/Dockerfile.coco-as-grpc