Upgrade json library (IDFGH-4532)

[joelguittet]

Is your feature request related to a problem? Please describe.

I'm working on an application depending of cJSON.
The current ESP-IDF is fetching cJSON 1.7.12, but I need a later version because new API fonctions are available ("cJSON_GetNumberValue" in my example).

Describe the solution you'd like

Upgrade the library to the latest release which is v1.7.14 (instead of v1.7.12).

Describe alternatives you've considered

Forking ESP-IDF in my github and have the modification locally. I prefer this to be supported in the mainline (and it will benefit other people).

Additional context

Nothing more.

[Alvin1Zhang]

Thanks for raising this feature request, thanks.

[AxelLin]

Hi,
There are a couple null pointer dereference fixes after v1.7.14.
I think it worth update for the cjson component, please check below in cJson git tree:
$ git shortlog --no-merges 8e84db4c4e631c5578a1d2365bbcc9d814ab8a51..HEAD