Bump codecov/codecov-action from 1 to 2.1.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1 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](https://github.com/codecov/codecov-action/compare/v1...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] <support@github.com>

.github/workflows/continuous-integration.yml

@@ -118,7 +118,7 @@ jobs:
         run: "./vendor/bin/phpunit --verbose --colors=always --coverage-text --coverage-clover build/logs/clover.xml"
 
       - name: "Publish coverage report to Codecov"
-        uses: "codecov/codecov-action@v1"
+        uses: "codecov/codecov-action@v2.1.0"
 
   unit-tests:
     name: "Unit Tests"