Fix DynamoDB compatibility with Python 3.10 and newer.
Import Mapping from collections.abc instead of collections, as the
deprecated collections.Mapping alias was removed in Python 3.10.
--- ../boto/dynamodb/types.py	2026-10-18 00:33:10.362470812 +0300
+++ ../boto/dynamodb/types.py	2026-10-18 00:33:28.025607338 +0300
@@ -27,7 +27,7 @@
 import base64
 from decimal import (Decimal, DecimalException, Context,
                      Clamped, Overflow, Inexact, Underflow, Rounded)
-from collections import Mapping
+from collections.abc import Mapping
 from boto.dynamodb.exceptions import DynamoDBNumberError
 from boto.compat import filter, map, six, long_type