chore: lowest dependency job uses PHP 7.4

Author: fquffio

.github/workflows/test.yml

@@ -149,7 +149,7 @@ jobs:
       - name: 'Setup PHP'
         uses: 'shivammathur/setup-php@v2'
         with:
-          php-version: '8.1'
+          php-version: '7.4'
           tools: 'composer'
 
       - name: 'Discover Composer cache directory'