Drop support for PyPy and psycopg2cffi [skip ci]

issue11330
review386371003

setup.py

@@ -136,7 +136,6 @@ 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',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = {py37,py38,py39,py310}-{sqlite,postgresql},pypy3-{sqlite,postgresql}
+envlist = {py37,py38,py39,py310}-{sqlite,postgresql}
 
 [testenv]
 commands =
@@ -7,8 +7,7 @@ commands =
     coverage report --include=.*/sale_discount/* --omit=*/tests/*
 deps =
     coverage
-    {py37,py38,py39,py310}-postgresql: psycopg2 >= 2.5
-    pypy3-postgresql: psycopg2cffi >= 2.5
+    postgresql: psycopg2 >= 2.7.0
 setenv =
     sqlite: TRYTOND_DATABASE_URI={env:SQLITE_URI:sqlite://}
     postgresql: TRYTOND_DATABASE_URI={env:POSTGRESQL_URI:postgresql://}