Session::clean() is private (BC break)

Author: dg

src/Http/Session.php

@@ -304,9 +304,8 @@ public function getIterator(): \Iterator
 
 	/**
 	 * Cleans and minimizes meta structures. This method is called automatically on shutdown, do not call it directly.
-	 * @internal
 	 */
-	public function clean(): void
+	private function clean(): void
 	{
 		if (!$this->isStarted()) {
 			return;