[Actions] Do not double quote the commit msg. (#17793)

.github/workflows/sdk-insertion-bump.yml

@@ -25,6 +25,6 @@ jobs:
           token: ${{ secrets.SERVICEACCOUNT_PAT }}
           event-type: 'sdk_insertion' 
           repository: 'xamarin/sdk-insertions'
-          client-payload: '{"repository": "xamarin/xamarin-macios", "branch": "${{ github.ref_name }}", "commit": "${{ github.sha }}", "commit_message": "${{ steps.commit_title.outputs.COMMIT_TITLE }}"}'
+          client-payload: '{"repository": "xamarin/xamarin-macios", "branch": "${{ github.ref_name }}", "commit": "${{ github.sha }}", "commit_message": ${{ steps.commit_title.outputs.COMMIT_TITLE }} }'