Bump Magnum Cluster API to 0.28.0

Change-Id: Ib76a20b23cba4e3b0e7a55495728ee14c5da6c70
diff --git a/images/magnum/Dockerfile b/images/magnum/Dockerfile
index b649c1a..4ad7ae2 100644
--- a/images/magnum/Dockerfile
+++ b/images/magnum/Dockerfile
@@ -20,7 +20,7 @@
 pip3 install \
     --constraint /upper-constraints.txt \
         /src/magnum \
-        magnum-cluster-api==0.27.0
+        magnum-cluster-api==0.28.0
 EOF
 
 FROM openstack-python-runtime
diff --git a/releasenotes/notes/bump-mcapi-75db7cc58ba546d2.yaml b/releasenotes/notes/bump-mcapi-75db7cc58ba546d2.yaml
new file mode 100644
index 0000000..6ee47d1
--- /dev/null
+++ b/releasenotes/notes/bump-mcapi-75db7cc58ba546d2.yaml
@@ -0,0 +1,3 @@
+fixes:
+  - The Cluster API driver for Magnum has been bumped to 0.28.0 to improve
+    stability, fix bugs and add new features.