Update flake8-pyi to 26.5.0 (#15762)

Author: srittau

.pre-commit-config.yaml

@@ -36,7 +36,7 @@ repos:
       - id: flake8
         language: python
         additional_dependencies:
-          - "flake8-pyi==25.5.0"
+          - "flake8-pyi==26.5.0"
         types: [file]
         types_or: [python, pyi]
   - repo: meta