Bump codecov/codecov-action from 2.0.2 to 2.0.3

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2.0.2 to 2.0.3.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v2.0.2...v2.0.3)

---
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/CI.yml

@@ -68,7 +68,7 @@ jobs:
       run: ./cargo-tarpaulin tarpaulin --out Xml
 
     - name: Upload to codecov.io
-      uses: codecov/codecov-action@v2.0.2
+      uses: codecov/codecov-action@v2.0.3
       with:
         token: ${{ secrets.CODECOV_TOKEN }}