Merge pull request #7418 from mnaser/slack/mcapi

chore: add magnum-cluster-api channel

Author: k8s-ci-robot

communication/slack-config/channels.yaml

@@ -306,6 +306,7 @@ channels:
   - name: litmus
   - name: litmus-dev
   - name: lokomotive
+  - name: magnum-cluster-api
   - name: malaysia-users
   - name: malta-users
   - name: meet-our-contributors