chore(librarian): fix not found

Author: parthea

.generator/parse_googleapis_content.py

@@ -92,7 +92,6 @@
     "alias",
     "py_test",
     "sh_binary",
-    "proto_library",
     "java_proto_library",
     "genrule",
     "gapic_yaml_from_disco",
@@ -130,6 +129,7 @@ def fake_glob(paths=[], **args):
         return []
 
     mod.add_callable("package", noop_bazel_rule)
+    mod.add_callable("proto_library", noop_bazel_rule)
 
     for glob_callable in _GLOB_CALLABLES:
         mod.add_callable(glob_callable, fake_glob)