chore: bump docker/build-push-action from 5.3.0 to 6.6.1

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5.3.0 to 6.6.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5.3.0...v6.6.1)

---
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/release.yml

@@ -88,7 +88,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: "Build and push WebGoat"
-        uses: docker/build-push-action@v5.3.0
+        uses: docker/build-push-action@v6.6.1
         with:
           context: ./
           file: ./Dockerfile
@@ -101,7 +101,7 @@ jobs:
             webgoat_version=${{ env.WEBGOAT_MAVEN_VERSION }}
 
       - name: "Build and push WebGoat desktop"
-        uses: docker/build-push-action@v5.3.0
+        uses: docker/build-push-action@v6.6.1
         with:
           context: ./
           file: ./Dockerfile_desktop