oauth2: use new jmsn wrapper header
#include <fluent-bit/flb_oauth2.h>
#include <fluent-bit/flb_upstream.h>
#include <fluent-bit/flb_http_client.h>
-
-#include <jsmn/jsmn.h>
+#include <fluent-bit/flb_jsmn.h>
#define free_temporary_buffers() \
if (prot) { \
