Switch from deprecated u2004 to u2204 image for github actions

Author: nzlosh

.github/workflows/lint-and-unit-tests.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   build-and-test-python:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     # NOTE: Lifted from https://github.com/StackStorm/st2/blob/master/.github/workflows/ci.yaml#L183
     services:
       mongo: