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)

.github/workflows/test.yml

@@ -67,7 +67,9 @@ jobs:
         APCA_API_KEY_ID: ${{ secrets.APCA_API_KEY_ID }}
         APCA_API_SECRET_KEY: ${{ secrets.APCA_API_SECRET_KEY }}
     - name: Upload code coverage results
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       with:
         files: lcov.info
   clippy: