Nixpkgs: gjs failed to build

[indocomsoft]

Specifically, I'm getting exactly as this failed hydra job: https://hydra.nixos.org/build/125198506

Describe the bug
gjs failed to build with seemingly spurious test failure

To Reproduce
installing (+ building) gjs nix package should succeed

Expected behavior
The job should pass

Screenshots
nil

Additional context
https://hydra.nixos.org/build/125198506

Notify maintainers

Metadata
Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

 - system: `"x86_64-linux"`
 - host os: `Linux 5.7.14, NixOS, 20.09.git.d4bbe9a3ed8 (Nightingale)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.7`
 - channels(root): `"nixos-20.03.1950.48723f48ab9"`
 - nixpkgs: `/home/julius/nixpkgs`

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module: 

[doronbehar]

This also blocks the channel to progress as this failure causes hydra tests to fail, ref #95440 . cc @NixOS/gnome .

[jtojnar]

Fixed by https://github.com/NixOS/nixpkgs/pull/95382

[benley]

(closing on the assumption that #95382 actually fixes this; please reopen if that's not the case)