flake.lock: Update (#941)

Flake lock file updates:

• Updated input 'devenv':
    'github:cachix/devenv/3d39d08' (2026-06-26)
  → 'github:cachix/devenv/d1fb321' (2026-07-08)
• Updated input 'devenv/ghostty':
    'github:ghostty-org/ghostty/4b7bf0b' (2026-05-18)
  → 'github:ghostty-org/ghostty/e1d31de' (2026-07-01)
• Updated input 'devenv/git-hooks':
    'github:cachix/git-hooks.nix/61ab0e8' (2026-05-11)
  → 'github:cachix/git-hooks.nix/9f7e991' (2026-07-01)
• Removed input 'devenv/git-hooks/gitignore'
• Removed input 'devenv/git-hooks/gitignore/nixpkgs'
• Updated input 'devenv/nix':
    'github:cachix/nix/0bc443c' (2026-05-25)
  → 'github:cachix/nix/782ac1b' (2026-06-25)
• Updated input 'devenv/nixd':
    'github:nix-community/nixd/e3e45eb' (2026-05-10)
  → 'github:nix-community/nixd/0e07c08' (2026-06-02)
• Updated input 'devenv/nixd/treefmt-nix':
    'github:numtide/treefmt-nix/790751f' (2026-04-08)
  → 'github:numtide/treefmt-nix/db94781' (2026-05-31)
• Updated input 'devenv/nixpkgs':
    'github:cachix/devenv-nixpkgs/8f24a22' (2026-05-11)
  → 'github:cachix/devenv-nixpkgs/12866ae' (2026-06-22)
• Updated input 'devenv/nixpkgs/nixpkgs-src':
    'github:NixOS/nixpkgs/b3da656' (2026-05-08)
  → 'github:NixOS/nixpkgs/3e41b24' (2026-06-16)
• Updated input 'devenv/rust-overlay':
    'github:oxalica/rust-overlay/2a77b5b' (2026-05-18)
  → 'github:oxalica/rust-overlay/13139ae' (2026-07-01)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/4062d36' (2026-06-25)
  → 'github:NixOS/nixpkgs/74cc63f' (2026-07-08)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: brianmay-actions