chore(deps): update flake inputs

[arcuru]

Flake Input Update

Monthly nix flake update of Nix dependencies.

Input Changes

• crane: 7cf72d9 → 692f7e9
• fenix: dfe3f19 → c9d2350
• flake-parts: 3107b77 → 9d0d871
• nixpkgs: 4c1018d → 34ab990
• treefmt-nix: 790751f → 27b3b12

nix flake update output

unpacking 'github:ipetkov/crane/692f7e9ef2ece8125b466f66f2af532b3edaed0d' into the Git cache...
unpacking 'github:nix-community/fenix/c9d23506b787a5f5bad51b50231738127761f4c5' into the Git cache...
unpacking 'github:hercules-ci/flake-parts/9d0d87172c374f89da73c1cfe6d81ae62feac1f1' into the Git cache...
unpacking 'github:nixos/nixpkgs/34ab99075ac4f7e40cf037eef32cb1c360bb85e9' into the Git cache...
unpacking 'github:numtide/treefmt-nix/27b3b12a8e6375f28ebe122f07d230ca5459bbfa' into the Git cache...
warning: updating lock file "/home/runner/work/headjack/headjack/flake.lock":
• Updated input 'crane':
    'github:ipetkov/crane/7cf72d9' (2026-04-10)
  → 'github:ipetkov/crane/692f7e9' (2026-08-21)
• Updated input 'fenix':
    'github:nix-community/fenix/dfe3f19' (2026-04-12)
  → 'github:nix-community/fenix/c9d2350' (2026-08-31)
• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/3107b77' (2026-04-01)
  → 'github:hercules-ci/flake-parts/9d0d871' (2026-08-24)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/4c1018d' (2026-04-09)
  → 'github:nixos/nixpkgs/34ab990' (2026-08-31)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/790751f' (2026-04-08)
  → 'github:numtide/treefmt-nix/27b3b12' (2026-08-16)

Hold

This PR is on hold until 2026-09-08 (7-day waiting period).
The on-hold label will be automatically removed after the hold expires.