pack: use new jmsn wrapper header
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_sds.h>
#include <fluent-bit/flb_time.h>
-#include <jsmn/jsmn.h>
+#include <fluent-bit/flb_jsmn.h>
+
#include <msgpack.h>
/* JSON types */
