Bump pytype version. (#8478)

Picks up a fix for the pytype test failure in
#8469.

Author: rchen152

requirements-tests.txt

@@ -1,5 +1,5 @@
 mypy==0.971
-pytype==2022.6.23; platform_system != "Windows"
+pytype==2022.8.3; platform_system != "Windows"
 # must match .pre-commit-config.yaml
 black==22.6.0
 # must match .pre-commit-config.yaml