Bump flake8-pyi to 25.5.0 (#14140)

.flake8

@@ -3,7 +3,7 @@
 # F821: Typeshed is a testing ground for flake8-pyi, which monkeypatches F821
 select = Y, F821
 # Ignore rules normally excluded by default
-extend-ignore = Y090
+extend-ignore = Y090,Y091
 per-file-ignores =
   # Generated protobuf files:
   # Y021: Include docstrings

.pre-commit-config.yaml

@@ -36,7 +36,7 @@ repos:
       - id: flake8
         language: python
         additional_dependencies:
-          - "flake8-pyi==24.9.0"
+          - "flake8-pyi==25.5.0"
         types: [file]
         types_or: [python, pyi]
   - repo: meta

stubs/docutils/docutils/utils/math/math2html.pyi

@@ -180,7 +180,7 @@ class Globable:
     def globincluding(self, magicchar): ...
     def globexcluding(self, excluded): ...
     def pushending(self, ending, optional: bool = False) -> None: ...
-    def popending(self, expected: Incomplete | None = None): ...
+    def popending(self, expected=None): ...
     def nextending(self): ...
 
 class EndingList: