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

@@ -24,7 +24,7 @@
         "php-soap/engine": "^2.16.0",
         "psr/cache": "^3.0",
         "psr/cache-implementation": "^3.0",
-        "azjezz/psl": "^3.0 || ^4.0 || ^5.0"
+        "php-standard-library/php-standard-library": "^3.0 || ^4.0 || ^5.0 || ^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~12.3",