bug#48274: 27.2; libjanson: \u0000 is not allowed without JSON_ALLOW_NUL

[Lars Ingebrigtsen]

Philipp <p.stephani2@gmail.com> writes:

> We use the default behavior of Jansson here, see the remark about
> JSON_ALLOW_NUL in
> https://jansson.readthedocs.io/en/2.13/apiref.html#decoding.
> I wouldn't mind allowing escaped NUL characters though; Emacs should
> be able to handle them just fine.
> Also see the FIXME in the unit test `json-parse-string/null' in
> tests/src/json-tests.el.

So I've now made this change in Emacs 29.

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