ci: increase timeout for backend release

This should only be necessary with no cache.
As soon as we stop building rattler-build from source we should put it back to 40 minutes

Author: Hofer-Julian

.github/workflows/backends-release.yml

@@ -26,7 +26,7 @@ concurrency:
 jobs:
   build:
     if: ${{ github.ref == 'refs/heads/main' || contains(github.event.pull_request.labels.*.name, 'release:backends')}}
-    timeout-minutes: 40
+    timeout-minutes: 80
     permissions:
       id-token: write
       contents: read