Test with Ubuntu 22.04 for Python 3.7

Author: jg-rp

.github/workflows/tests.yaml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-22.04, windows-latest, macos-latest]
         python-version: ["3.7.17", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         exclude:
           - os: macos-latest