chore: use gapic-generator-python 0.51.2

Google APIs · copybara-github · commit b224dfa52642 · 2021-09-23T09:46:41.000-07:00
fix: add 'dict' annotation type to 'request' Committer: @busunkim96 PiperOrigin-RevId: 398509016
diff --git a/WORKSPACE b/WORKSPACE
@@ -230,7 +230,7 @@ load("@rules_python//python:pip.bzl", "pip_repositories")
 
 pip_repositories()
 
-_gapic_generator_python_version = "0.50.5"
+_gapic_generator_python_version = "0.51.2"
 
 http_archive(
     name = "gapic_generator_python",
