Disallow plugin php-http/discovery

mixins.yml

@@ -18,6 +18,8 @@
     # Add the Drupal Vendor Hardening Composer Plugin.
     # see https://github.com/drupal/core-vendor-hardening
     - composer config --no-plugins --no-interaction allow-plugins.drupal/core-vendor-hardening true
+    # Disallowing plugin script.
+    - composer config --no-plugins --no-interaction allow-plugins.php-http/discovery false
 
 .customreferences:
   LanguageFiles: []