chore: Fix codesmell

See also: https://sonarcloud.io/project/issues?id=poetry-core&open=AX5towEhmZqnEonFAx80&pullRequest=263&resolved=false&types=CODE_SMELL

tests/testutils.py

@@ -7,8 +7,8 @@
 from contextlib import contextmanager
 from pathlib import Path
 from typing import Any
-from typing import ContextManager
 from typing import Dict
+from typing import Generator
 from typing import List
 from typing import Optional
 
@@ -26,7 +26,7 @@
 @contextmanager
 def temporary_project_directory(
     path: Path, toml_patch: Optional[Dict[str, Any]] = None
-) -> ContextManager[str]:
+) -> Generator[str, None, None]:
     """
     Context manager that takes a project source directory, copies content to a temporary
     directory, patches the `pyproject.toml` using the provided patch, or using the default