Bump psycopg to 3.1.8+ (#9815)

The earliest supported Django version 4.2 recommends using psycopg>=3.1.8

https://docs.djangoproject.com/en/4.2/ref/databases/#postgresql-notes

requirements/requirements-optionals.txt

@@ -5,6 +5,6 @@ django-filter
 django-guardian>=2.4.0,<2.5
 inflection==0.5.1
 markdown>=3.3.7
-psycopg2-binary>=2.9.5,<2.10
+psycopg[binary]>=3.1.8
 pygments~=2.17.0
 pyyaml>=5.3.1,<5.4

rest_framework/compat.py

@@ -16,7 +16,7 @@ def unicode_http_header(value):
     return value
 
 
-# django.contrib.postgres requires psycopg2
+# django.contrib.postgres requires psycopg
 try:
     from django.contrib.postgres import fields as postgres_fields
 except ImportError:

tests/test_serializer_nested.py

@@ -315,7 +315,7 @@ if postgres_fields:
             required_db_features = {'supports_json_field'}
 
 
-@pytest.mark.skipif(not postgres_fields, reason='psycopg2 is not installed')
+@pytest.mark.skipif(not postgres_fields, reason='psycopg is not installed')
 class TestNestedNonRelationalFieldWrite:
     """
     Test that raise_errors_on_nested_writes does not raise `AssertionError` when the