Replace azjezz/psl with php-standard-library/php-standard-library

Swap to the official fork and add ^6.0 to the version constraint.

Ref: phpro/soap-client#604

Author: veewee

composer.json

@@ -16,7 +16,7 @@
     ],
     "require": {
         "php": "~8.3.0 || ~8.4.0 || ~8.5.0",
-        "azjezz/psl": "^3.0 || ^4.0 || ^5.0",
+        "php-standard-library/php-standard-library": "^3.0 || ^4.0 || ^5.0 || ^6.0",
         "php-soap/xml": "^1.9.0"
     },
     "autoload-dev": {