test: fix test suite import on master with Python 3.1

diff --git a/tests/pq/test_pgconn.py b/tests/pq/test_pgconn.py
index cbe33a2dcf447569c2e917dfa825b26a7dd09b47..de5271449d92d4042da62771f382afe2e2c688b8 100644 (file)
--- a/tests/pq/test_pgconn.py
+++ b/tests/pq/test_pgconn.py
@@ -9,15 +9,17 @@ import logging
 import weakref
 from functools import partial
 from select import select
-from typing import Iterator
+from typing import Iterator, TYPE_CHECKING
 
 import pytest
 
 import psycopg
 from psycopg import pq
-from psycopg.pq.abc import PGcancelConn, PGconn
 import psycopg.generators
 
+if TYPE_CHECKING:
+    from psycopg.pq.abc import PGcancelConn, PGconn
+
 
 def wait(
     conn: PGconn | PGcancelConn,