test: try ${{}} format

Author: thomasrockhu-codecov

.github/workflows/ci.yml

@@ -21,5 +21,5 @@ jobs:
  - name: Upload coverage to Codecov with override
  uses: codecov/codecov-action@v3
  with:
- override_commit: ${GITHUB_SHA}
+ override_commit: ${{ GITHUB_SHA }}
  verbose: true