Don't look in wp-cli-tests folder

This folder will also have a vendor folder and PHPStan will try and read
every file in there, likely running out of memory eventually.

Author: mrsdizzie

phpstan.neon.dist

@@ -5,7 +5,6 @@ parameters:
     - config-command.php
   scanDirectories:
     - vendor/wp-cli/wp-cli/php
-    - vendor/wp-cli/wp-cli-tests
   scanFiles:
     - vendor/php-stubs/wordpress-stubs/wordpress-stubs.php
   treatPhpDocTypesAsCertain: false