Use codecov github action instead of deprecated bash uploader (#9252)

Fixes #9202.

.github/workflows/main.yml

@@ -165,11 +165,17 @@ jobs:
       if: "matrix.use_coverage"
       run: "tox -e ${{ matrix.tox_env }}-coverage"
 
-    - name: Upload coverage
-      if: matrix.use_coverage && github.repository == 'pytest-dev/pytest'
-      env:
-        CODECOV_NAME: ${{ matrix.name }}
-      run: bash scripts/upload-coverage.sh -F GHA,${{ runner.os }}
+    - name: Generate coverage report
+      if: "matrix.use_coverage"
+      run: python -m coverage xml
+
+    - name: Upload coverage to Codecov
+      if: "matrix.use_coverage"
+      uses: codecov/codecov-action@v2
+      with:
+        fail_ci_if_error: true
+        files: ./coverage.xml
+        verbose: true
 
   deploy:
     if: github.event_name == 'push' && startsWith(github.event.ref, 'refs/tags') && github.repository == 'pytest-dev/pytest'