revert to older requests version

lib/urllib3/util/queue.py

@@ -1,21 +0,0 @@
-import collections
-from ..packages import six
-from ..packages.six.moves import queue
-
-if six.PY2:
-    # Queue is imported for side effects on MS Windows. See issue #229.
-    import Queue as _unused_module_Queue  # noqa: F401
-
-
-class LifoQueue(queue.Queue):
-    def _init(self, _):
-        self.queue = collections.deque()
-
-    def _qsize(self, len=len):
-        return len(self.queue)
-
-    def _put(self, item):
-        self.queue.append(item)
-
-    def _get(self):
-        return self.queue.pop()