Bump codecov/codecov-action from 2 to 3

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2 to 3.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-action/compare/v2...v3)

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

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

.github/workflows/phpunit.yml

@@ -100,7 +100,7 @@ jobs:
               run: php bin/phpunit  --coverage-clover clover.xml
 
             - name: Coverage
-              uses: codecov/codecov-action@v2
+              uses: codecov/codecov-action@v3
               with:
                   token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
                   files: ./clover.xml