Change CI to use ubuntu-latest instead of deprecated ubuntu-20.04

Co-authored-by: pamelafox <297042+pamelafox@users.noreply.github.com>

Author: Copilot

.github/workflows/python-check.yaml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-20.04"]
+        os: ["ubuntu-latest"]
         python_version: ["3.10"]
     steps:
         - uses: actions/checkout@v4