fix: add classifier for python 3.11 (#31)

Author: parthea

packages/grpc-google-iam-v1/setup.py

@@ -67,6 +67,7 @@
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],