chore: use gapic-generator-python 0.63.2

Google APIs · copybara-github · commit 55b9e1e0b310 · 2022-02-10T10:53:00.000-08:00
docs: add generated snippets

PiperOrigin-RevId: 427792504
diff --git a/WORKSPACE b/WORKSPACE
@@ -225,7 +225,7 @@ load("@rules_python//python:pip.bzl", "pip_repositories")
 
 pip_repositories()
 
-_gapic_generator_python_version = "0.63.1"
+_gapic_generator_python_version = "0.63.2"
 
 http_archive(
     name = "gapic_generator_python",
