Refs #33308 -- Modernized database wrapper in the PostgreSQL backend.

- Used connection.info instead of connection.get_parameter_status() and
  connection.server_info which don't exist in psycopg 3.
- Set encoding using the client_encoding connection parameter instead
  of connection.set_client_encoding() that doesn't exist in psycopg 3.
- Used the dbname connection parameter instead of deprecated
  alias - database.

tests/backends/postgresql/tests.py

@@ -164,7 +164,7 @@ class Tests(TestCase):
         settings["NAME"] = None
         settings["OPTIONS"] = {"service": "django_test"}
         params = DatabaseWrapper(settings).get_connection_params()
-        self.assertEqual(params["database"], "postgres")
+        self.assertEqual(params["dbname"], "postgres")
         self.assertNotIn("service", params)
 
     def test_connect_and_rollback(self):