Bump codecov/codecov-action from 4.2.0 to 4.3.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4.2.0 to 4.3.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4.2.0...v4.3.0)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/pythonpackage.yml

@@ -53,7 +53,7 @@ jobs:
         pytest --cov=micom --cov-report=xml
     - name: Upload to codecov
       if: matrix.os == 'ubuntu-latest' && matrix.python-version == 3.9
-      uses: codecov/codecov-action@v4.2.0
+      uses: codecov/codecov-action@v4.3.0
 
   release:
       needs: test