Bump docker/build-push-action from 5 to 6 (#1653)

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](docker/build-push-action@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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build-test-app.yml

@@ -33,7 +33,7 @@ jobs:
           TAGS="${{ env.REGISTRY }}/${{ env.REPOSITORY }}:latest"
           echo "tags=$TAGS" >> $GITHUB_OUTPUT
       - name: Push Image to repo
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: test/app
           push: true

.github/workflows/rebuild-released-images.yaml

@@ -137,7 +137,7 @@ jobs:
           username: ${{ env.QUAY_ROBOT_NAME }}
           password: ${{ secrets.QUAY_PASSWORD }}
       - name: Build and push operator to the DockerHub (daily-tag & release-tag)
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ${{ steps.pick-dockerfile.outputs.dockerfile }}