deps: update simdjson to 4.6.1

PR-URL: nodejs/node#62592
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: nodejs-github-bot

deps/simdjson/simdjson.cpp

@@ -1,4 +1,4 @@
-/* auto-generated on 2026-03-25 17:25:37 -0400. version 4.5.0 Do not edit! */
+/* auto-generated on 2026-04-03 15:25:03 -0400. version 4.6.1 Do not edit! */
 /* including simdjson.cpp:  */
 /* begin file simdjson.cpp */
 #define SIMDJSON_SRC_SIMDJSON_CPP