Bump MCAPI to 0.21.2 (#1643)

Co-authored-by: okozachenko1203 <okozachenko1203@users.noreply.github.com>
diff --git a/images/magnum/Dockerfile b/images/magnum/Dockerfile
index 546b80f..c4c78ea 100644
--- a/images/magnum/Dockerfile
+++ b/images/magnum/Dockerfile
@@ -19,7 +19,7 @@
 pip3 install \
     --constraint /upper-constraints.txt \
         /src/magnum \
-        magnum-cluster-api==0.21.1
+        magnum-cluster-api==0.21.2
 EOF
 
 FROM registry.atmosphere.dev/library/openstack-python-runtime:${RELEASE}