test: ensure read-only temp files are removed

tests/conftest.py

@@ -30,6 +30,7 @@ from poetry.repositories import Repository
 from poetry.utils.env import EnvManager
 from poetry.utils.env import SystemEnv
 from poetry.utils.env import VirtualEnv
+from poetry.utils.helpers import safe_rmtree
 from tests.helpers import TestLocker
 from tests.helpers import TestRepository
 from tests.helpers import get_package
@@ -306,7 +307,7 @@ def tmp_dir() -> Iterator[str]:
 
     yield dir_
 
-    shutil.rmtree(dir_)
+    safe_rmtree(dir_)
 
 
 @pytest.fixture