chore: Update gapic-generator-python to v1.16.1

Google APIs · copybara-github · commit 078a38bd2408 · 2024-03-22T11:43:32.000-07:00
PiperOrigin-RevId: 618243632
diff --git a/WORKSPACE b/WORKSPACE
@@ -323,7 +323,7 @@ load("@rules_gapic//python:py_gapic_repositories.bzl", "py_gapic_repositories")
 
 py_gapic_repositories()
 
-_gapic_generator_python_version = "1.15.0"
+_gapic_generator_python_version = "1.16.1"
 
 http_archive(
     name = "gapic_generator_python",
