ci(lint): Avoid changing Optional[int] -> int | None (#29836)

Author: evanpurkhiser

.pre-commit-config.yaml

@@ -23,7 +23,7 @@ repos:
     - id: pyupgrade
       name: pyupgrade
       entry: pyupgrade
-      args: ['--py38-plus']
+      args: ['--py38-plus', '--keep-runtime-typing']
       language: system
       types: [python]
       # We can't change this mock to unittest.mock until Python 3.8,