Fix typo in metadata classifiers

Author: Cleptomania

setup.cfg

@@ -21,7 +21,7 @@ classifiers =
   Programming Language :: Python :: 3.8
   Programming Language :: Python :: 3.9
   Programming Language :: Python :: 3.10
-  Programming Langauge :: Python :: 3.11
+  Programming Language :: Python :: 3.11
   Programming Language :: Python :: Implementation :: CPython
   Topic :: Software Development :: Libraries :: Python Modules