fix ci artifact version

Author: purarue

.github/workflows/main.yml

@@ -32,7 +32,7 @@ jobs:
 
       - run: ./install
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v4
         with:
           name: .coverage.mypy-${{ matrix.platform }}_${{ matrix.python-version }}
           path: .coverage.mypy/