Merge pull request to fix incompatibility with Twig v3.21

Redefines ForeachTokenParser::parseAssignmentExpression slightly to account for new protected function of the same name.

Author: iquito

src/TokenParser/ForeachTokenParser.php

@@ -66,7 +66,7 @@ public function getTag(): string
     /*
      * Taken from ExpressionParser::parseAssignmentExpression, we just exchanged the operator usage from , to =>
      */
-    private function parseAssignmentExpression(): Node
+    protected function parseAssignmentExpression(): Nodes
     {
         $stream = $this->parser->getStream();
         $targets = [];