Remove unused function _removesuffix

Author: bluetech

pytest_asyncio/plugin.py

@@ -656,12 +656,6 @@ def _patched_collect():
         collector.obj.__pytest_asyncio_scoped_event_loop = scoped_event_loop
 
 
-def _removesuffix(s: str, suffix: str) -> str:
-    if sys.version_info < (3, 9):
-        return s[: -len(suffix)]
-    return s.removesuffix(suffix)
-
-
 @contextlib.contextmanager
 def _temporary_event_loop_policy(policy: AbstractEventLoopPolicy) -> Iterator[None]:
     old_loop_policy = asyncio.get_event_loop_policy()