Bump codecov/codecov-action from 3 to 4 in /.github/workflows

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci_workflows.yml

@@ -95,6 +95,6 @@ jobs:
       run: tox ${{ matrix.toxargs }} -v -e ${{ matrix.toxenv }}
     - name: Upload coverage to codecov
       if: ${{ contains(matrix.toxenv,'-cov') }}
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         file: ./coverage.xml