Use ubuntu-22.04 runner for older python versions

Author: flabbamann

.github/workflows/test.yml

@@ -11,9 +11,9 @@ jobs:
       matrix:
         include:
           - python-version: "3.7"
-            os: ubuntu-20.04
+            os: ubuntu-22.04
           - python-version: "3.8"
-            os: ubuntu-20.04
+            os: ubuntu-22.04
           - python-version: "3.9"
             os: ubuntu-latest
           - python-version: "3.10"