chore: Remove deprecated LICENSE classifier

Author: LightDestory

setup.cfg

@@ -13,7 +13,6 @@ project_urls =
 classifiers =
     Development Status :: 5 - Production/Stable
     Environment :: Console
-    License :: OSI Approved :: GNU General Public License v3 (GPLv3)
     Operating System :: OS Independent
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10