setup.py: Drop deprecated trove license classifier

License classifier are deprecated since Setuptools >=77.0.0:
- https://setuptools.pypa.io/en/stable/history.html#v77-0-0
- pypa/setuptools@0d8f1f2

Author: hartwork

setup.py

@@ -33,7 +33,6 @@
     classifiers=[
         "Intended Audience :: Developers",
         "Intended Audience :: System Administrators",
-        "License :: OSI Approved :: MIT License",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",