chore(deps): update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/evals.yml

@@ -41,7 +41,7 @@ jobs:
                   EOF
 
             - name: Build image
-              uses: docker/build-push-action@v5
+              uses: docker/build-push-action@v6
               with:
                   context: .
                   file: packages/evals/Dockerfile.runner