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

plugins/php-imap/vendor/illuminate/contracts/Database/Query/Builder.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Illuminate\Contracts\Database\Query;
+
+/**
+ * This interface is intentionally empty and exists to improve IDE support.
+ *
+ * @mixin \Illuminate\Database\Query\Builder
+ */
+interface Builder
+{
+}