flatbuffers: update bindings, add verifier

nostrdb/flatcc/flatcc_json_parser.h

@@ -20,7 +20,7 @@ extern "C" {
 #include "flatcc_unaligned.h"
 
 #define PDIAGNOSTIC_IGNORE_UNUSED
-#include "pdiagnostic_push.h"
+#include "portable/pdiagnostic_push.h"
 
 enum flatcc_json_parser_flags {
     flatcc_json_parser_f_skip_unknown = 1,
@@ -886,7 +886,7 @@ int flatcc_json_parser_struct_as_root(flatcc_builder_t *B, flatcc_json_parser_t
         const char *buf, size_t bufsiz, int flags, const char *fid,
         flatcc_json_parser_struct_f *parser);
 
-#include "pdiagnostic_pop.h"
+#include "portable/pdiagnostic_pop.h"
 
 #ifdef __cplusplus
 }