chore: update python microgenerator to v0.50.2

Google APIs · copybara-github · commit 2bf1e2a6711b · 2021-06-28T10:45:37.000-07:00
PiperOrigin-RevId: 381898347
diff --git a/WORKSPACE b/WORKSPACE
@@ -224,7 +224,7 @@ load("@rules_python//python:pip.bzl", "pip_repositories")
 
 pip_repositories()
 
-_gapic_generator_python_version = "0.50.0"
+_gapic_generator_python_version = "0.50.2"
 
 http_archive(
     name = "gapic_generator_python",
