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/run_tests_matlab.yml

@@ -49,7 +49,7 @@ jobs:
           bash <(curl -s https://codecov.io/bash)
 
       - name: Code coverage
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v3
         with:
           file: coverage.xml # optional
           flags: unittests # optional