Merge branch 'undo-nixpkgs-upgrade-of-2024-02-05' into 'develop'

Revert "bump nixpkgs"

See merge request !456

nixpkgs.json

 {
   "name": "source",
-  "url": "https://releases.nixos.org/nixos/23.11/nixos-23.11.3920.25e3d4c0d359/nixexprs.tar.xz",
-  "sha256": "1wx3qxnz0pm3ld7k6gfvlxs7cv8dvj26917c3136ihvg7znfj1i8"
+  "url": "https://releases.nixos.org/nixos/23.11/nixos-23.11.2962.b8dd8be3c790/nixexprs.tar.xz",
+  "sha256": "053dwx7smszz3a0khbm6zvf9pvy5xz1ifdk9jx6gz5cmwjab0gmp"
 }
\ No newline at end of file