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)

Signed-off-by: Daniel Müller <deso@posteo.net>

.github/workflows/test.yml

@@ -136,7 +136,9 @@ jobs:
         PYTHON: ${{ steps.py312.outputs.python-path }}
       run: cargo llvm-cov --workspace --all-targets --features=nightly,generate-large-test-files --ignore-filename-regex=cli/src/ --lcov --output-path lcov.info -- --include-ignored
     - 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
   test-sanitizers: