Bump respect/stringifier from 0.2 to 1.0

I've released version 1.0 many years ago, but somehow I forgot to
upgrade the version in Validation. This commit does that, just almost 3
years too late.

I'm not upgrading it to 2.0 because there are too many changes, and
especially because version 2.0 stringifies callbacks, which might cause
secutiry issues.

Author: henriquemoody

composer.json

@@ -19,7 +19,7 @@
     },
     "require": {
         "php": ">=8.1",
-        "respect/stringifier": "^0.2.0",
+        "respect/stringifier": "^0.2.0 || ^1.0",
         "symfony/polyfill-mbstring": "^1.2"
     },
     "require-dev": {