Run slowest jobs first to speed up build

.github/workflows/tests.yml

@@ -15,8 +15,8 @@ jobs:
     name: tests
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [windows-latest, macos-latest, ubuntu-latest]
-        python: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', 'pypy-3.9']
+        python: ['pypy-3.9', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
         exclude:
           # pypy3 currently fails to run on Windows
           - os: windows-latest