Rename the SRO channel to KMM.

This rename follows the repo rename in kubernetes/org#3587.

Author: qbarrand

communication/slack-config/channels.yaml

@@ -401,9 +401,10 @@ channels:
   - name: sig-network
   - name: sig-node
   - name: sig-node-bug-scrub
+  - name: sig-node-kmm
+    id: C037RE58RED
   - name: sig-node-rkt
     archived: true
-  - name: sig-node-sro
   - name: sig-node-swap
   - name: sig-scalability
   - name: sig-scheduling