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](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]>

.github/workflows/cnspec.yaml

@@ -69,7 +69,7 @@ jobs:
 
       - name: Build and push cnspec image
         id: build-and-push-operator
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: cnspec.Dockerfile

.github/workflows/publish.yaml

@@ -104,7 +104,7 @@ jobs:
       # https://github.com/docker/build-push-action
       - name: Build and push operator image
         id: build-and-push-operator
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: ${{ matrix.os }}/${{ matrix.arch }}
@@ -244,7 +244,7 @@ jobs:
       # Build and push Docker image bundle with Buildx
       - name: Build and push bundle image
         id: build-and-push-bundle
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: bundle.Dockerfile