Use PHP 8.5 for benchmark CI

Author: veewee

.github/workflows/benchmarks.yaml

@@ -13,7 +13,7 @@ jobs:
             - name: Install PHP
               uses: shivammathur/setup-php@master
               with:
-                  php-version: '8.4'
+                  php-version: '8.5'
                   tools: 'composer:v2'
                   extensions: mbstring, dom, soap
                   coverage: none