module_utils/waiters: adjust location of RetryingBotoClientWrapper

`RetryingBotoClientWrapper` should now be loaded from
`ansible_collections.amazon.aws.plugins.module_utils.retries`.

See: ansible-collections/amazon.aws#1230

plugins/module_utils/waiters.py

@@ -12,9 +12,15 @@
 except ImportError:
     pass  # caught by HAS_BOTO3
 
-from ansible_collections.amazon.aws.plugins.module_utils.modules import (
-    _RetryingBotoClientWrapper,
-)
+try:
+    # See: https://github.com/ansible-collections/amazon.aws/pull/1230
+    from ansible_collections.amazon.aws.plugins.module_utils.retries import (
+        RetryingBotoClientWrapper,
+    )
+except ImportError:
+    from ansible_collections.amazon.aws.plugins.module_utils.modules import (
+        _RetryingBotoClientWrapper,
+    )
 
 
 cloudcontrolapi_data = {
@@ -94,7 +100,7 @@ def cloudcontrolapi_model(name):
 
 
 def get_waiter(client, waiter_name):
-    if isinstance(client, _RetryingBotoClientWrapper):
+    if isinstance(client, RetryingBotoClientWrapper):
         return get_waiter(client.client, waiter_name)
     try:
         return waiters_by_name[(client.__class__.__name__, waiter_name)](client)