Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

---
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>

.github/workflows/ci.yml

@@ -83,7 +83,7 @@ jobs:
       - run: python -m pip install Django~="${{ matrix.django-version }}.0"
       - run: python -m pip install -e .[test]
       - run: python -m pytest -m "not selenium"
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
 
   Selenium:
     needs:
@@ -109,4 +109,4 @@ jobs:
       - run: python -m pip install Django
       - run: python -m pip install -e .[test,selenium]
       - run: python -m pytest -m selenium
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4