Remove nearly all __str__ and __repr__ methods from typeshed (#6968)

stubs/filelock/filelock/__init__.pyi

@@ -4,7 +4,6 @@ from types import TracebackType
 
 class Timeout(TimeoutError):
     def __init__(self, lock_file: str) -> None: ...
-    def __str__(self) -> str: ...
 
 class _Acquire_ReturnProxy:
     def __init__(self, lock: str) -> None: ...