fix version

Author: diamonwiggins

.github/workflows/embedded-cluster-release-notes.yml

@@ -91,5 +91,5 @@ jobs:
         webhook: ${{ secrets.EMBEDDED_CLUSTER_RELEASE_NOTES_SLACK_WEBHOOK }}
         webhook-type: webhook-trigger
         payload: |
-          version: "${{ github.event.client_payload.version }}"
+          version: "${{ github.event.inputs.version }}"
           pull_request_url: "${{steps.cpr.outputs.pull-request-url}}"