build(poetry): clean up PyPI trove classifiers

Poetry [automatically adds](https://python-poetry.org/docs/pyproject/#classifiers) Python and licence classifiers.

Author: jakob-keller

pyproject.toml

@@ -42,17 +42,8 @@ classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
     "Intended Audience :: Developers",
-    "License :: OSI Approved :: MIT License",
     "Natural Language :: English",
     "Operating System :: OS Independent",
-    "Programming Language :: Python",
-    "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: Implementation :: CPython",
 ]
 
 [tool.poetry.dependencies]