build(deps): bump codecov/codecov-action from 1 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1 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@v1...v4)

---
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

@@ -92,7 +92,7 @@ jobs:
           REACTANT_TEST_GROUP: ${{ matrix.test_group }}
       - uses: julia-actions/julia-processcoverage@v1
         if: steps.run_tests.outcome == 'success'
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v4
         if: steps.run_tests.outcome == 'success'
         with:
           file: lcov.info