change test image workflow

Author: joknarf

.github/workflows/pythons-tests.yml

@@ -2,7 +2,7 @@ name: pythons tests
 on: [push, pull_request]
 jobs:
   run:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix: