[wallaby] Release python-magnumclient 3.4.1

This includes the bugfix [1] that makes error
messages actually readable.

[1] https://review.opendev.org/c/openstack/python-magnumclient/+/785602

Change-Id: I919c83041df5a274d60115d64badae230a5b0383

deliverables/wallaby/python-magnumclient.yaml

@@ -15,6 +15,10 @@ releases:
     projects:
       - repo: openstack/python-magnumclient
         hash: e2bcf6e98011f04f7768ab5859077f43093166d8
+  - version: 3.4.1
+    projects:
+      - repo: openstack/python-magnumclient
+        hash: 280acd2dff27d49d7606877edc3f17482f7444f6
 branches:
   - name: stable/wallaby
     location: 3.4.0