Merge pull request #7011 from ellistarn/karp-dev

chore: add karpenter-dev channel for karpenter contributors

Author: k8s-ci-robot

communication/slack-config/channels.yaml

@@ -180,6 +180,7 @@ channels:
   - name: kalm
   - name: kaniko
   - name: karpenter
+  - name: karpenter-dev
   - name: k8s-dual-stack
     archived: true
   - name: k8s-infra-alerts