:bug: Fix SimdJSON null string

diff --git a/plug b/plug
index 3ccbeda146be08a71283258ad98747531a1df297..a2ff0cb4c28d79cb265572999339176a3e941f2e 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit 3ccbeda146be08a71283258ad98747531a1df297
+Subproject commit a2ff0cb4c28d79cb265572999339176a3e941f2e