fix(test_postgresql): copy dict instead of create pointers

tests/test_postgresql.py

@@ -346,9 +346,9 @@ def check_ha(db_conn: dict, errors: int = 0) -> int:
 
     # check replication
     print("Checking replication state:")
-    primary = db_conn
+    primary = db_conn.copy()
     primary["port"] = 54321
-    standby = db_conn
+    standby = db_conn.copy()
     standby["port"] = 54322
     status, info = check_replication(primary, standby)
     if not status: