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

plugins/php-imap/vendor/illuminate/contracts/Database/Eloquent/SerializesCastableAttributes.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Illuminate\Contracts\Database\Eloquent;
+
+use Illuminate\Database\Eloquent\Model;
+
+interface SerializesCastableAttributes
+{
+    /**
+     * Serialize the attribute when converting the model to an array.
+     *
+     * @param  \Illuminate\Database\Eloquent\Model  $model
+     * @param  string  $key
+     * @param  mixed  $value
+     * @param  array  $attributes
+     * @return mixed
+     */
+    public function serialize(Model $model, string $key, mixed $value, array $attributes);
+}