chore: Update docker/build-push-action to v6

Author: Muscraft

.github/workflows/nightly.yml

@@ -103,7 +103,7 @@ jobs:
           tags: ${{ matrix.tags }}
 
       - name: Build and push image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ${{ matrix.context }}
           platforms: ${{ matrix.platforms }}