Update docker/build-push-action action to v6.18.0

Author: renovate[bot]

.github/workflows/ci.yml

@@ -139,7 +139,7 @@ jobs:
         run: echo "FROM localhost:5000/${{ env.DOCKER_IMAGE }}:\${TARGETOS}-\${TARGETARCH}" >> docker-file-${{ matrix.registry }}-wyrihaximusnet-github-action-runner
       - run: cat docker-file-${{ matrix.registry }}-wyrihaximusnet-github-action-runner
       - name: Merged different arch images into one
-        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
         with:
           push: ${{ github.event_name != 'pull_request' }}
           context: .