:art: update modules

diff --git a/ast b/ast
index 91bc85b8a29566ffcd055b6912629533ea45f55b..b648fbdea475b7f6bd86372c40f0d3876440b3fc 160000 (submodule)
--- a/ast
+++ b/ast
@@ -1 +1 @@
-Subproject commit 91bc85b8a29566ffcd055b6912629533ea45f55b
+Subproject commit b648fbdea475b7f6bd86372c40f0d3876440b3fc

diff --git a/util b/util
index 8037f8cce3c5da5fb7c6d343e6dd705a30753ac5..1f1fe812713e2f17cbd8dd178bec14d390a305ec 160000 (submodule)
--- a/util
+++ b/util
@@ -1 +1 @@
-Subproject commit 8037f8cce3c5da5fb7c6d343e6dd705a30753ac5
+Subproject commit 1f1fe812713e2f17cbd8dd178bec14d390a305ec