refactor: remove deprecated isBanned method

app/User.php

@@ -103,19 +103,6 @@ class User extends Authenticatable implements MustVerifyEmail
 
     // UTILITY LOGIC
 
-    /**
-     * Checks if a user is banned.
-     *
-     * @deprecated This method is obsolete, as it has been replaced by the suspension service.
-     * @see AccountSuspensionService::isSuspended()
-     *
-     * @return bool Whether the user is banned
-     */
-    public function isBanned(): bool
-    {
-        return ! $this->bans()->get()->isEmpty();
-    }
-
     public function isStaffMember()
     {
         return $this->hasAnyRole('reviewer', 'admin', 'hiringManager');