Fixed Python coverage on Windows GHA

.github/workflows/test-windows.yml

@@ -364,6 +364,13 @@ jobs:
         name: errors
         path: Tests/errors
 
+    - name: After success
+      if: success()
+      run: |
+        .ci/after_success.sh
+      env:
+        MATRIX_OS: ${{ matrix.os }}
+
     - name: Prepare coverage token
       if: success() && github.repository == 'python-pillow/Pillow'
       run: cp .github/codecov-upstream.yml .codecov.yml
@@ -373,6 +380,7 @@ jobs:
       uses: codecov/codecov-action@v1
       with:
           token: ${{ secrets.CODECOV_TOKEN }}
+          file: ./coverage.xml
           name: ${{ runner.os }} Python ${{ matrix.python-version }}
 
     - name: Build wheel