Use Incomplete instead of Any in __getattr__ (#8903)

stubs/flake8-bugbear/bugbear.pyi

@@ -1,5 +1,6 @@
 import argparse
 import ast
+from _typeshed import Incomplete
 from collections.abc import Sequence
 from typing import Any
 
@@ -23,6 +24,6 @@ class BugBearChecker:
         max_line_length: int = ...,
         options: argparse.Namespace | None = ...,
     ) -> None: ...
-    def __getattr__(self, name: str) -> Any: ...  # incomplete (other attributes are normally not accessed)
+    def __getattr__(self, name: str) -> Incomplete: ...  # incomplete (other attributes are normally not accessed)
 
-def __getattr__(name: str) -> Any: ...  # incomplete (other attributes are normally not accessed)
+def __getattr__(name: str) -> Incomplete: ...