jsonschema no longer requires pyrsistent but the outdated lock files
still think thats the case. There is no point in peer dependency pinning
in nixpkgs, so we might as well use the input files with only direct
dependencies.
checkInputs used to be added to nativeBuildInputs. Now we have
nativeCheckInputs to do that instead. Doing this treewide change allows
to keep hashes identical to before the introduction of
nativeCheckInputs.
