[Bug other/126162] gen-MAINTAINERS.py depends on some undocumented version of jsonschema.validators

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126162

--- Comment #10 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to Drea Pinski from comment #8)
> Note ubuntu 2404's  jsonschema does not have this I get an error there too.

I built and tested this on ubuntu 24.04 using the installed package.