Skip some Python versions on macOS tests

They fails with dependency installation errors, no idea why.

Author: saghul

.github/workflows/ci.yml

@@ -11,6 +11,13 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: [ '3.8', '3.9', '3.10', '3.11', '3.12', 'pypy-3.8' ]
+        exclude:
+          - os: macos-latest
+            python-version: 3.8
+          - os: macos-latest
+            python-version: 3.9
+          - os: macos-latest
+            python-version: pypy-3.8
     steps:
     - uses: actions/checkout@v3
     - name: Setup Python