Use assignment instead of annotation in third party enums (#11957)

stubs/flake8/flake8/options/manager.pyi

@@ -3,14 +3,14 @@ from _typeshed import Incomplete
 from collections.abc import Callable, Sequence
 from enum import Enum
 from logging import Logger
-from typing import Any, Final
+from typing import Any
 
 from ..plugins.finder import Plugins
 
 LOG: Logger
 
 class _ARG(Enum):
-    NO: Final = 1
+    NO = 1
 
 class Option:
     short_option_name: Incomplete

stubs/flake8/flake8/style_guide.pyi

@@ -9,16 +9,16 @@ from .statistics import Statistics
 __all__ = ("StyleGuide",)
 
 class Selected(enum.Enum):
-    Explicitly: str
-    Implicitly: str
+    Explicitly = "explicitly selected"
+    Implicitly = "implicitly selected"
 
 class Ignored(enum.Enum):
-    Explicitly: str
-    Implicitly: str
+    Explicitly = "explicitly ignored"
+    Implicitly = "implicitly ignored"
 
 class Decision(enum.Enum):
-    Ignored: str
-    Selected: str
+    Ignored = "ignored error"
+    Selected = "selected error"
 
 class DecisionEngine:
     cache: Incomplete