flake.lock: Update

Flake lock file updates:

• Updated input 'bombon':
    'github:nikstur/bombon/9696201' (2025-06-01)
  → 'github:nikstur/bombon/a241b30' (2025-12-03)
• Removed input 'bombon/flake-parts'
• Removed input 'bombon/flake-parts/nixpkgs-lib'
• Updated input 'bombon/nixpkgs':
    'github:NixOS/nixpkgs/910796c' (2025-05-31)
  → 'github:NixOS/nixpkgs/e9f00bd' (2025-09-28)
• Removed input 'bombon/pre-commit-hooks-nix'
• Removed input 'bombon/pre-commit-hooks-nix/flake-compat'
• Removed input 'bombon/pre-commit-hooks-nix/gitignore'
• Removed input 'bombon/pre-commit-hooks-nix/gitignore/nixpkgs'
• Removed input 'bombon/pre-commit-hooks-nix/nixpkgs'
• Removed input 'bombon/systems'
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/8a6d542' (2025-08-27)
  → 'github:nixos/nixpkgs/c5296fd' (2026-01-23)

Author: github-actions[bot]