Merge pull request matplotlib#20682 from matplotlib/dependabot/github_actions/codecov/codecov-action-2.0.1

Bump codecov/codecov-action from 1 to 2

Author: tacaswell

.github/workflows/tests.yml

@@ -230,7 +230,7 @@ jobs:
           find . -name '*.gc*' -delete
         if: ${{ runner.os != 'macOS' }}
       - name: Upload code coverage
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v2
 
       - uses: actions/upload-artifact@v2
         if: failure()