Log Message:
jansson: updated to 2.13

Version 2.13

* New Features:
  - Add `jansson_version_str()` and `jansson_version_cmp()` for runtime
    version checking
  - Add `json_object_update_new()`, `json_object_update_existing_new()`
    and `json_object_update_missing_new()` functions
  - Add `json_object_update_recursive()`

* Build:
  - Add ``-Wno-format-truncation`` to suppress format truncation warnings

* Bug fixes:
  - Remove ``strtod`` macro definition for MinGW
  - Add infinite loop check in `json_deep_copy()`
  - Add ``pipe`` macro definition for MinGW
  - Enhance ``JANSSON_ATTRS`` macro to support earlier C standard(C89)
  - Update version detection for sphinx-build

* Documentation:
  - Fix typos
  - Document that call the custom free function to free the return value
    of `json_dumps()` if you have a custom malloc/free
  - Add vcpkg installation instructions
  - Document that non-blocking file descriptor is not supported on