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] <[email protected]>

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
       - run: bundle exec rspec
-      - uses: codecov/[email protected].2
+      - uses: codecov/[email protected].3
         with:
           name: ${{ matrix.ruby }}
           file: ./coverage/coverage.xml