Update docker/build-push-action digest to 9f6f8c9

Author: renovate[bot]

.github/workflows/docker-image.yml

@@ -30,7 +30,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@6e95f19fb8c9e00a1a391941edbc0ae30c1799f7
+        uses: docker/build-push-action@9f6f8c940b91232557f8699b21341a08624a8dce
         with:
           context: .
           push: true