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/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v2...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/ci.yml

@@ -299,7 +299,7 @@ jobs:
           pip install -r requirements/requirements_tests.txt
           xvfb-run pytest -v --cov=ansys.mapdl.core --cov-report=xml --cov-report=html
 
-      - uses: codecov/codecov-action@v2
+      - uses: codecov/codecov-action@v3
         if: matrix.mapdl-version == 'v21.2.1'
         name: 'Upload coverage to Codecov'