WIP: CI: Limit tests

Author: phdru

.github/workflows/run-tests.yaml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "=3.9[build=*_pypy]"]
+        python-version: ["2.7", "3.5"]
 
         include:
         - os: ubuntu-latest