Update release.yml

Author: danirabbit

.github/workflows/release.yml

@@ -44,7 +44,7 @@ jobs:
       fail-fast: false
 
     container:
-      image: ghcr.io/elementary/flatpak-platform/runtime:8-${{ matrix.configuration.arch }}
+      image: ghcr.io/elementary/flatpak-platform/runtime:8.1-${{ matrix.configuration.arch }}
       options: --privileged
 
     steps: