Bump codecov/codecov-action from 1.5.0 to 2.1.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1.5.0 to 2.1.0.
- [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...v2.1.0)

---
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/main.yml

@@ -49,7 +49,7 @@ jobs:
         if: matrix.php-versions == '7.4' && matrix.dependencies == 'highest'
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1.5.0
+        uses: codecov/codecov-action@v2.1.0
         if: matrix.php-versions == '7.4' && matrix.dependencies == 'highest'
 
   phpcs: