chore: update copyright year to 2022

Google APIs · copybara-github · commit b3397f5febbf · 2022-02-25T15:03:37.000-08:00
PiperOrigin-RevId: 431037888
diff --git a/WORKSPACE b/WORKSPACE
@@ -225,7 +225,7 @@ load("@rules_python//python:pip.bzl", "pip_repositories")
 
 pip_repositories()
 
-_gapic_generator_python_version = "0.63.4"
+_gapic_generator_python_version = "0.63.5"
 
 http_archive(
     name = "gapic_generator_python",
