Bump codecov/codecov-action from 1.5.0 to 1.5.2

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1.5.0 to 1.5.2.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v1.5.0...v1.5.2)

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

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

.github/workflows/testing.yml

@@ -97,7 +97,7 @@ jobs:
       run: tox ${{ matrix.toxargs }} -e ${{ matrix.toxenv }} -- ${{ matrix.toxposargs }}
     - name: Upload coverage to codecov
       if: ${{ contains(matrix.toxenv,'-cov') }}
-      uses: codecov/codecov-action@v1.5.0
+      uses: codecov/codecov-action@v1.5.2
       with:
         file: ./coverage.xml
   build-n-publish: