Merge pull request #8 from ryonakano/chore/actions-bump-runtime

Actions: Updates runtime version to 8.1

Author: xchan14

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
 
     # This job runs in a special container designed for building Flatpaks for AppCenter
     container:
-      image: ghcr.io/elementary/flatpak-platform/runtime:7.3
+      image: ghcr.io/elementary/flatpak-platform/runtime:8.1
       options: --privileged
 
     # Steps represent a sequence of tasks that will be executed as part of the job