Remove [no-mentions] handler in our triagebot config

https://github.blog/changelog/2025-11-07-removing-notifications-for-mentions-in-commit-messages/

Author: Urgau

triagebot.toml

@@ -15,9 +15,6 @@ contributing_url = "https://github.com/rust-lang/libc/blob/HEAD/CONTRIBUTING.md"
 [issue-links]
 check-commits = false # don't forbid links to issues
 
-# Prevents mentions in commits to avoid users being spammed
-[no-mentions]
-
 # Enable comments linking to triagebot range-diff when a PR is rebased
 # onto a different base commit
 # Documentation at: https://forge.rust-lang.org/triagebot/range-diff.html