Merge pull request #27 from matplotlib/dependabot/github_actions/codecov/codecov-action-5.4.3

Bump codecov/codecov-action from 1.5.2 to 5.4.3

Author: tacaswell

.github/workflows/testing.yml

@@ -44,4 +44,4 @@ jobs:
         coverage report
 
     - name: Upload code coverage
-      uses: codecov/codecov-action@29386c70ef20e286228c72b668a06fd0e8399192 # v1
+      uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24 # v5.4.3