chore: require PHP 7.4.3+

PASSWORD_DEFAULT was int 1; now is string '2y' (in PHP 7.4.0, 7.4.1, and 7.4.2 it was null)
https://www.php.net/manual/en/migration74.incompatible.php#migration74.incompatible.core.password-algorithm-constants

Author: kenjis

composer.json

@@ -18,7 +18,7 @@
     ],
     "homepage": "https://github.com/codeigniter4/shield",
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^7.4.3 || ^8.0",
         "codeigniter4/settings": "^2.0"
     },
     "require-dev": {