ci: bump codecov/codecov-action from 3 to 4 (#6902)

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](https://github.com/codecov/codecov-action/compare/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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci-main.yml

@@ -101,7 +101,7 @@ jobs:
           poetry run make test
           poetry run coverage xml
       - if: ${{ always() }}
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           flags: unit
   test-integration:
@@ -118,7 +118,7 @@ jobs:
           poetry run coverage run manage.py test tests/integration
           poetry run coverage xml
       - if: ${{ always() }}
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           flags: integration
   test-e2e:
@@ -167,7 +167,7 @@ jobs:
           poetry run coverage run manage.py test ${{ matrix.job.glob }}
           poetry run coverage xml
       - if: ${{ always() }}
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           flags: e2e
   ci-core-mark: