Switch back to 20.04-xl runners

22.04-xl doesn't appear to exist.

Author: lcartey

.github/workflows/code-scanning-pack-gen.yml

@@ -36,7 +36,7 @@ jobs:
   create-code-scanning-pack:
     name: Create Code Scanning pack
     needs: prepare-code-scanning-pack-matrix
-    runs-on: ubuntu-22.04-xl
+    runs-on: ubuntu-20.04-xl
     strategy:
       fail-fast: false
       matrix: ${{ fromJSON(needs.prepare-code-scanning-pack-matrix.outputs.matrix) }}