utils/encrypt.py: remove unused private _LOCK (#81614)

Added in #15299, unused since #30160.

Fixes #81613

changelogs/fragments/81613-remove-unusued-private-lock.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - lib/ansible/utils/encrypt.py - remove unused private ``_LOCK`` (https://github.com/ansible/ansible/issues/81613)

lib/ansible/utils/encrypt.py

@@ -4,7 +4,6 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-import multiprocessing
 import random
 import re
 import string
@@ -43,8 +42,6 @@ display = Display()
 
 __all__ = ['do_encrypt']
 
-_LOCK = multiprocessing.Lock()
-
 DEFAULT_PASSWORD_LENGTH = 20