Remove benchmark alert user mention (#2346)

Author: gabrielbosio

.github/workflows/bench.yml

@@ -42,6 +42,5 @@ jobs:
         auto-push: true
         alert-threshold: '130%'
         comment-on-alert: true
-        alert-comment-cc-users: '@unbalancedparentheses'
     - name: Clean benches
       run: make clean