[ci] Fix PyPy venv caching issue (#10392)

Author: cdce8p

.github/workflows/tests.yaml

@@ -49,7 +49,8 @@ jobs:
         uses: actions/[email protected]
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/[email protected]
+        # Custom with PyPy fix: https://github.com/actions/setup-python/pull/1110
+        uses: cdce8p/[email protected]
         with:
           python-version: ${{ matrix.python-version }}
           check-latest: true