:art: Update ast

diff --git a/ast b/ast
index ab88e5f56ae040323c1a09a3e66b50d606567de9..6b54c43130be74b1227c472838f20054d5808979 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit ab88e5f56ae040323c1a09a3e66b50d606567de9
+Subproject commit 6b54c43130be74b1227c472838f20054d5808979