Restore BOOLEANS import in basic.py (#42008)

This import was removed by mistake. This is required for backward
compatibility.

Fixes: #41988

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

changelogs/fragments/basic_booleans_backward_compat.yaml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+- Restore module_utils.basic.BOOLEANS variable for backwards compatibility with the module API in older ansible releases.

lib/ansible/module_utils/basic.py

@@ -172,7 +172,7 @@ from ansible.module_utils.six import (
 )
 from ansible.module_utils.six.moves import map, reduce, shlex_quote
 from ansible.module_utils._text import to_native, to_bytes, to_text
-from ansible.module_utils.parsing.convert_bool import BOOLEANS_FALSE, BOOLEANS_TRUE, boolean
+from ansible.module_utils.parsing.convert_bool import BOOLEANS, BOOLEANS_FALSE, BOOLEANS_TRUE, boolean
 
 
 # Note: When getting Sequence from collections, it matches with strings.  If