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

plugins/php-imap/vendor/psr/container/src/ContainerExceptionInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Psr\Container;
+
+use Throwable;
+
+/**
+ * Base interface representing a generic exception in a container.
+ */
+interface ContainerExceptionInterface extends Throwable
+{
+}