Merge pull request #5477 from mrbobbytables/add-meeting

Slack: Update SIG ContribEx channels

Author: k8s-ci-robot

communication/slack-config/channels.yaml

@@ -336,7 +336,9 @@ channels:
   - name: sig-configuration
     archived: true
   - name: sig-contribex
+  - name: sig-contribex-meetings
   - name: sig-contribex-triage
+    archived: true
   # sig-docs* channels are defined in sig-docs/
   - name: sig-high-availability
     archived: true