flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/c3c27e603b0d9b5aac8a16236586696338856fbb' (2025-05-16)
  → 'github:nix-community/fenix/0f19d25425626ea42bded065029f45ca5f526ca1' (2025-10-26)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/f8e784353bde7cbf9a9046285c1caf41ac484ebe' (2025-05-15)
  → 'github:rust-lang/rust-analyzer/daf1cd953fe878226e3a5b0356468f5a61995bf0' (2025-10-25)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/063f43f2dbdef86376cc29ad646c45c46e93234c' (2025-05-23)
  → 'github:NixOS/nixpkgs/6a08e6bb4e46ff7fcbb53d409b253f6bad8a28ce' (2025-10-25)

Author: github-actions[bot]