chore: bump codecov/codecov-action from 2.1.0 to 3 (#856)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2.1.0 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@f32b3a3...e3c5604)

---
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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/cover.yaml

@@ -20,6 +20,6 @@ jobs:
       - name: Unit test
         run: make unit-test
       # pinning to the sha f32b3a3741e1053eb607407145bc9619351dc93b from https://github.com/codecov/codecov-action/releases/tag/v2.1.0
-      - uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b
+      - uses: codecov/codecov-action@e3c560433a6cc60aec8812599b7844a7b4fa0d71
         with:
           files: ./coverage.txt