Upgrade flake8-pyi to 22.5.1 (#7882)

Author: AlexWaygood

requirements-tests.txt

@@ -4,7 +4,7 @@ pytype==2022.5.10; platform_system != "Windows"
 black==22.3.0
 flake8==4.0.1
 flake8-bugbear==21.11.29
-flake8-pyi==22.5.0
+flake8-pyi==22.5.1
 # must match .pre-commit-config.yaml
 isort==5.10.1
 tomli==1.2.2