bugfix: update ubuntu version for pr cleanup action

Signed-off-by: Philipp Ahmann <[email protected]>

Author: pahmann

.github/workflows/pr-close.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   delete_preview:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     env:
       PR_PATH: pull/${{github.event.number}}
     steps: