- Check for existence of astype.

.github/workflows/pytest.yml

@@ -11,7 +11,7 @@ jobs:
         os: [ubuntu-20.04, windows-2019, macOS-11]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with: