ci: add tests for PHP 8.5

Author: Chris8934

composer.json

@@ -13,7 +13,7 @@
     "require": {
         "php": "^7.4 | ^8.0",
         "php-http/httplug": "^2.0",
-        "psr/http-client": "^1.0",
+        "psr/http-client": "^1.0.3",
         "guzzlehttp/guzzle": "^7.0"
     },
     "require-dev": {

phpunit.xml.dist

@@ -3,7 +3,7 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     colors="true"
     bootstrap="vendor/autoload.php"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd">
   <coverage>
     <include>
       <directory suffix=".php">src/</directory>