Bump codecov/codecov-action from 2.1.0 to 3

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@v2.1.0...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

@@ -141,7 +141,7 @@ jobs:
           make test
           poetry run coverage xml
       - name: Upload coverage
-        uses: codecov/codecov-action@v2.1.0
+        uses: codecov/codecov-action@v3
         with:
           file: ./coverage.xml
           flags: unit