[TMP] Added Ubuntu 20.04 and 22.04 to CI

Author: ssun30

.github/workflows/CI.yml

@@ -66,7 +66,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.9"]
-        os: [macos-13, macos-latest, ubuntu-latest]
+        os: [macos-13, macos-latest, ubuntu-20.04, ubuntu-22.04, ubuntu-latest]
         include-rms: ["", "with RMS"]
         exclude:
           - os: macos-13  # GitHub's runners just aren't up to the task of installing Julia