Update docker/build-push-action action to v6.12.0

Signed-off-by: renovate[bot] <[email protected]>

Author: renovate[bot]

.github/workflows/buildx-stage.yaml

@@ -116,7 +116,7 @@ jobs:
           password: ${{ secrets.QUAY_ROBOT_TOKEN }}
       - name: build and push
         if: ${{ steps.check.outputs.build == 'y' && !inputs.dry-run }}
-        uses: docker/build-push-action@b32b51a8eda65d6793cd0494a773d4f6bcef32dc # v6.11.0
+        uses: docker/build-push-action@67a2d409c0a876cbe6b11854e3e25193efe4e62d # v6.12.0
         with:
           context: .
           push: true