pkg: add Py 3.11 to classifiers

pyproject.toml

@@ -25,6 +25,7 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
 
     "Intended Audience :: Developers",
     "Intended Audience :: Customer Service",