Bump codecov/codecov-action from 1 to 3

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1 to 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@v1...v3)

---
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/moxunit.yml

@@ -31,7 +31,7 @@ jobs:
         cover_xml_file: coverage.xml
 
     - name: Code coverage
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v3
       with:
        token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
        file:  coverage.xml # optional