Merge pull request #104 from matplotlib/dependabot/github_actions/codecov/codecov-action-4

Bump codecov/codecov-action from 3 to 4

Author: kthyng

.github/workflows/test.yaml

@@ -48,7 +48,7 @@ jobs:
         run: |
           pytest --cov=./ --cov-report=xml
       - name: Upload code coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           file: ./coverage.xml
           flags: unittests