⬆️ Update flake inputs and their dependencies

[jeyemwey]

This is necessary because Vite expects Node 22, and flake's nixpkgs only served Node 20. Now we're at a Node v22.17.0.

[jeyemwey]

Keine Ahnung, wer hier reviewen möchte, weil @NyCodeGHG und ich die einzigen beiden waren, die überhaupt das Flake benutzen (gehe ich von aus zumindest)

[NyCodeGHG]

This breaks when I try to nix develop --impure on a fresh setup, doesn't break without this PR (still kind of because of stuff in .env.example), (but the flake could also use a refactoring).

error:
       … while evaluating an expression to select 'drvPath' on it
         at «internal»:1:552:
       … while evaluating strict
         at «internal»:1:552:
       (stack trace truncated; use '--show-trace' to show the full trace)

       error: attribute 'DB_DATABASE' missing
       at /nix/store/ri1pq88aymnbrbpsk0dmkmvwspxzm5qq-source/flake.nix:52:35:
           51|               {
           52|                 name = config.env.DB_DATABASE;
             |                                   ^
           53|               }