Replace psycopg2, psycopg2cffi -> psycopg in testing and docs

Now that we only support Django>=4.2, can switch our testing and docs to
the newer library, and drop the PyPy compat hacks.

Note this does not affect psycopg2 support for users of the library in
any way.

docs/database.rst

@@ -325,16 +325,12 @@ Put this into ``conftest.py``::
     import pytest
     from django.db import connections
 
-    import psycopg2
-    from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
+    import psycopg
 
 
     def run_sql(sql):
-        conn = psycopg2.connect(database='postgres')
-        conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
-        cur = conn.cursor()
-        cur.execute(sql)
-        conn.close()
+        with psycopg.connect(database='postgres') as conn:
+            conn.execute(sql)
 
 
     @pytest.fixture(scope='session')
@@ -505,7 +501,7 @@ Put this in ``conftest.py``::
 
 .. warning::
     This snippet shows ``cursor().executescript()`` which is `sqlite` specific, for
-    other database engines this method might differ. For instance, psycopg2 uses
+    other database engines this method might differ. For instance, psycopg uses
     ``cursor().execute()``.
 
 

pyproject.toml

@@ -90,7 +90,6 @@ files = [
 module = [
     "django.*",
     "configurations.*",
-    "psycopg2cffi.*",
 ]
 ignore_missing_imports = true
 

pytest_django_test/settings_postgres.py

@@ -3,15 +3,6 @@
 from .settings_base import *  # noqa: F403
 
 
-# PyPy compatibility
-try:
-    from psycopg2cffi import compat
-
-    compat.register()
-except ImportError:
-    pass
-
-
 DATABASES = {
     "default": {
         "ENGINE": "django.db.backends.postgresql",

tests/conftest.py

@@ -74,14 +74,6 @@ def django_pytester(
         """
         import django
 
-        # Pypy compatibility
-        try:
-            from psycopg2cffi import compat
-        except ImportError:
-            pass
-        else:
-            compat.register()
-
         DATABASES = %(db_settings)s
         DATABASE_ROUTERS = ['pytest_django_test.db_router.DbRouter']
 

tox.ini

@@ -18,8 +18,7 @@ deps =
     mysql_myisam: mysqlclient==2.1.0
     mysql_innodb: mysqlclient==2.1.0
 
-    !pypy3-postgres: psycopg2-binary
-    pypy3-postgres: psycopg2cffi
+    postgres: psycopg[binary]
     coverage: coverage[toml]
     coverage: coverage-enable-subprocess