Remove the vendor directory in .gitignore as these dependencies are needed for php-imap

plugins/php-imap/vendor/illuminate/contracts/Validation/ValidationRule.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Illuminate\Contracts\Validation;
+
+use Closure;
+
+interface ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     * @return void
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void;
+}