chore(deps): Bump docker/build-push-action from 5 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v5...v6)

---
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>

.github/workflows/ci.yml

@@ -324,7 +324,7 @@ jobs:
             type=sha
       -
         name: Build and push to local registry
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./test
           file: ./test/Dockerfile
@@ -445,7 +445,7 @@ jobs:
             maintainer=Foo
       -
         name: Build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./test
           file: ./test/output.Dockerfile