Use Ubuntu 24.04.

Author: johnbillion

.github/workflows/phpbench-tests.yml

@@ -17,7 +17,7 @@ jobs:
   # Runs the PHPBench tests for WordPress.
   bench-php:
     name: PHP ${{ matrix.php }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     if: ${{ github.repository == 'WordPress/wordpress-develop' || github.event_name == 'pull_request' }}
     strategy:
       fail-fast: false