changed lowest dep to php 7.4

Author: transistive

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Set up PHP
         uses: shivammathur/[email protected]
         with:
-          php-version: 7.3
+          php-version: 7.4
           coverage: none
 
       - name: Checkout code