Use new get_rpc_client API from oslo.messaging

Use the new API that is consistent with
the existing API instead of instantiating the client
class directly.

This was introduced in release 14.1.0 here [1] and
added into oslo.messaging here [2]

[1] https://review.opendev.org/c/openstack/requirements/+/869340
[2] https://review.opendev.org/c/openstack/oslo.messaging/+/862419

Change-Id: I66bef4d339b5ee2462dc46f626fd1b2c6182b2cd

ironic_inspector/common/rpc.py

@@ -40,7 +40,7 @@ def get_client(topic=None):
                                   version='1.3')
     else:
         target = messaging.Target(topic=topic, version='1.3')
-    return messaging.RPCClient(TRANSPORT, target)
+    return messaging.get_rpc_client(TRANSPORT, target)
 
 
 def get_server(endpoints):

requirements.txt

@@ -27,7 +27,7 @@ oslo.context>=2.22.0 # Apache-2.0
 oslo.db>=12.1.0 # Apache-2.0
 oslo.i18n>=3.20.0 # Apache-2.0
 oslo.log>=4.3.0 # Apache-2.0
-oslo.messaging>=5.32.0 # Apache-2.0
+oslo.messaging>=14.1.0 # Apache-2.0
 oslo.middleware>=3.31.0 # Apache-2.0
 oslo.policy>=3.7.0 # Apache-2.0
 oslo.rootwrap>=5.8.0 # Apache-2.0