main/cjson: security upgrade to 1.7.17
https://github.com/DaveGamble/cJSON/compare/v1.7.16...v1.7.17
Fix null reference in cJSON_SetValuestring(CVE-2023-50472), see #809
Fix null reference in cJSON_InsertItemInArray(CVE-2023-50471), see #809 and #810