Update dependency magnum-cluster-api to v0.29.0 (stable/zed)

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Renovate-Branch: renovate/stable/zed-magnum-cluster-api-0.x
Change-Id: I971dcde40a0a3116ffada68683b910aaa7a13278
diff --git a/images/magnum/Dockerfile b/images/magnum/Dockerfile
index d636fd1..88571af 100644
--- a/images/magnum/Dockerfile
+++ b/images/magnum/Dockerfile
@@ -20,7 +20,7 @@
 pip3 install \
     --constraint /upper-constraints.txt \
         /src/magnum \
-        magnum-cluster-api==0.28.0
+        magnum-cluster-api==0.29.0
 EOF
 
 FROM openstack-python-runtime