Bump codecov/codecov-action from 1 to 3 (#122)

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/main/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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Todd Ekenstam <[email protected]>

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Run 'all' make target
       run: make all
     - name: Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v3
       with:
         file: ./coverage.txt # optional
         flags: unittests # optional