gh-103092: Isolate _collections (#103093)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>

Author: erlend-aasland

Diff for: Lib/collections/__init__.py

@@ -45,6 +45,11 @@
 else:
     _collections_abc.MutableSequence.register(deque)
 
+try:
+    from _collections import _deque_iterator
+except ImportError:
+    pass
+
 try:
     from _collections import defaultdict
 except ImportError:

Diff for: Misc/NEWS.d/next/Library/2023-04-09-06-59-36.gh-issue-103092.vskbro.rst

@@ -0,0 +1 @@
+Isolate :mod:`!_collections` (apply :pep:`687`). Patch by Erlend E. Aasland.