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/build-interop-docker.yml

@@ -34,7 +34,7 @@ jobs:
             echo 'tag=latest' | tee -a $GITHUB_OUTPUT;
             echo 'gitref=${{ github.sha }}' | tee -a $GITHUB_OUTPUT;
           fi
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         with:
           context: "{{defaultContext}}:interop"
           platforms: linux/amd64,linux/arm64