Drop support for PyPy and psycopg2cffi [skip ci]

issue11330
review386371003

setup.py

@@ -131,7 +131,6 @@ setup(name=name,
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Office/Business',
         ],
     license='GPL-3',