This is printed while evaluating the tests:
warning: In a derivation named 'neovim-unwrapped-0.10.1',
'structuredAttrs' disables the effect of the derivation attribute 'disallowedRequisites';
use 'outputChecks.<output>.disallowedRequisites' instead
It's probably an upstream issue, but creating a ticket here first.
rg 'disallowedRequisites' didn't find any matches in our repo and the error message seems to relate to the neovim-unwrapped package in nixpkgs.
First discussed #2035 (comment)