Fix test test_child_pids for PostgreSql 15 and higher (#146)

Author: demonolock

tests/test_simple.py

@@ -957,6 +957,9 @@ def test_child_pids(self):
 if pg_version_ge('10'):
 master_processes.append(ProcessType.LogicalReplicationLauncher)
 
+if pg_version_ge('14'):
+master_processes.remove(ProcessType.StatsCollector)
+
 repl_processes = [
 ProcessType.Startup,
 ProcessType.WalReceiver,