Log Message:
jansson: update to version 2.14

upstream location of releases moved.

Changelog:

Version 2.14
============

Released 2021-09-09

* New Features:

  - Add `json_object_getn`, `json_object_setn`, `json_object_deln`, and the
    corresponding `nocheck` functions. (#520, by Maxim Zhukov)

* Fixes:

  - Handle `sprintf` corner cases (#537, by Tobias Stoeckmann)

* Build:

  - Symbol versioning for all exported symbols (#540, by Simon McVittie)
  - Fix compiler warnings (#555, by Kelvin Lee)

* Documentation:

  - Small fixes (#544, #546, by @i-ky)
  - Sphinx 3 compatibility (#543, by Pierce Lopez)