Update php-http/mock-client requirement from ^1.0 to ^1.5

Author: github-actions[bot]

composer.json

@@ -80,7 +80,7 @@
         "infection/infection": "^0.26",
         "matthiasnoback/symfony-config-test": "^4.3.0",
         "nyholm/psr7": "^1.5",
-        "php-http/mock-client": "^1.0",
+        "php-http/mock-client": "^1.5",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpbench/phpbench": "^1.2",
         "phpstan/extension-installer": "^1.1",