chore: update docker/build-push-action action to v6.15.0

Author: renovate-bot

.github/workflows/docker-parallel-multiarch-build.yml

@@ -158,7 +158,7 @@ jobs:
 
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action@ca877d9245402d1537745e0e356eab47c3520991 # v6.13.0
+        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4 # v6.15.0
         with:
           context: ${{ inputs.context }}
           file: ${{ inputs.file }}