chore(deps): bump docker/build-push-action from 3 to 6 (#998)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v3...v6)

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

.github/workflows/ci.yaml

@@ -100,7 +100,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build multi-arch image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/arm64,linux/amd64

.github/workflows/publish-image.yaml

@@ -34,7 +34,7 @@ jobs:
           echo "TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV        
 
       - name: Build and Push Operator image
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: Dockerfile