[searx] fix JSON write for Gargantext

1 job for dev-searx-parser in 33 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #1812
test

00:00:33

 
Name Stage Failure
failed
test Test

Skipping Git submodules setup
Executing "step_script" stage of the job script
Using docker image sha256:1b9c5f5389cac0c77e3d942622ff5f554ee6626b6618b151fc72b4923f3bed34 for nixos/nix:latest with digest nixos/nix@sha256:27f6e7f60227e959ee7ece361f75d4844a40e1cc6878b6868fe30140420031ff ...
$ nix-env -i purescript-0.14.2 -f https://github.com/NixOS/nixpkgs/archive/bed08131cd29a85f19716d9351940bdc34834492.tar.gz
unpacking 'https://github.com/NixOS/nixpkgs/archive/bed08131cd29a85f19716d9351940bdc34834492.tar.gz'...
error: selector 'purescript-0.14.2' matches no derivations
Cleaning up file based variables
ERROR: Job failed: exit code 1