[pgp] Fix ruff errors

pgp/modules/events.py

@@ -15,8 +15,8 @@
 from __future__ import annotations
 
 from typing import Any
-from typing import Callable
 
+from collections.abc import Callable
 from dataclasses import dataclass
 from dataclasses import field
 

pgp/modules/util.py

@@ -39,7 +39,7 @@ def find_gpg():
             gpg_cmd = binary + " -h >nul 2>&1"
         else:
             gpg_cmd = binary + " -h >/dev/null 2>&1"
-        if subprocess.call(gpg_cmd, shell=True):
+        if subprocess.call(gpg_cmd, shell=True):  # noqa: S602
             return False
         return True