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

@@ -87,4 +87,4 @@ jobs:
       - run: python -m pip install "django==${{ matrix.django-version }}.*"
       - run: python -m pip install -e .[${{ matrix.extras }}]
       - run: python -m pytest
-      - uses: codecov/codecov-action@v2
+      - uses: codecov/codecov-action@v3