bugfix: failed to compilation on rocky-9.

Error: implicit truncation from 'unsigned int' to a one-bit wide bit-field changes value from 1 to -1

Author: zhuizhuhaomeng

src/ngx_http_rds_json_filter_module.h

@@ -106,9 +106,9 @@ typedef struct {
 
     uint32_t                             field_data_rest;
 
-    ngx_flag_t                           header_sent:1;
-    ngx_flag_t                           seen_stream_end:1;
-    ngx_flag_t                           generated_col_names:1;
+    ngx_uint_t                           header_sent:1;
+    ngx_uint_t                           seen_stream_end:1;
+    ngx_uint_t                           generated_col_names:1;
 } ngx_http_rds_json_ctx_t;