Bump docker/build-push-action from 6.5.0 to 6.6.1

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.5.0 to 6.6.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@5176d81...16ebe77)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/docker-testing.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@3d68780484996aa9d417bb9016193885cdf1f299 # v3.6.0
       - name: Build Docker image (no push)
-        uses: docker/build-push-action@5176d81f87c23d6fc96624dfdbcd9f3830bbe445 # v6.5.0
+        uses: docker/build-push-action@16ebe778df0e7752d2cfcbd924afdbbd89c1a755 # v6.6.1
         with:
           context: .
           file: "Dockerfile"