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

@@ -20,7 +20,7 @@
         "php-soap/wsdl": "^1.14",
         "php-soap/xml": "^1.9.0",
         "veewee/xml": "^3.0",
-        "azjezz/psl": "^3.0 || ^4.0 || ^5.0",
+        "php-standard-library/php-standard-library": "^3.0 || ^4.0 || ^5.0 || ^6.0",
         "symfony/console": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "webmozart/assert": "^1.11",
         "php-tui/php-tui": "^0.2.1"