Replaced Codecov bash uploader with GitHub Action

Author: radarhere

.github/workflows/test-mingw.yml

@@ -73,11 +73,11 @@ jobs:
           python3 -m pytest -vx --cov PIL --cov Tests --cov-report term --cov-report xml Tests
 
       - name: Upload coverage
-        run: |
-          python3 -m pip install codecov
-          bash <(curl -s https://codecov.io/bash) -F GHA_Windows
-        env:
-          CODECOV_NAME: ${{ matrix.name }}
+        uses: codecov/codecov-action@v3
+        with:
+          file: ./coverage.xml
+          flags: GHA_Windows
+          name: ${{ matrix.name }}
 
   success:
     permissions: