flake.lock: Update

Flake lock file updates:

• Updated input 'emacs-overlay':
    'github:nix-community/emacs-overlay/7245d675f0ce0eee78f4eac5966a4ea2c9132f3f?narHash=sha256-gG0QAv7ljKd0QvWTKrGYwOoIv9cDNgNn2fJlwcFvZxU%3D' (2025-10-15)
  → 'github:nix-community/emacs-overlay/fc9f5fc2de590ab90d9c89d2f66ad443efd3da4c?narHash=sha256-Xa8sYbZmHFmM%2BpJUxMyJJIWYELkN3BJma5hqlNjWpvU%3D' (2025-10-18)
• Updated input 'emacs-overlay/nixpkgs-stable':
    'github:NixOS/nixpkgs/a493e93b4a259cd9fea8073f89a7ed9b1c5a1da2?narHash=sha256-Tb%2BNYuJhWZieDZUxN6PgglB16yuqBYQeMJyYBGCXlt8%3D' (2025-10-14)
  → 'github:NixOS/nixpkgs/98ff3f9af2684f6136c24beef08f5e2033fc5389?narHash=sha256-/YdfibIrnqXAL8p5kqCU345mzpHoOtuVIkMiI2pF4Dc%3D' (2025-10-16)
• Updated input 'home-manager':
    'github:nix-community/home-manager/c53e65ec92f38d30e3c14f8d628ab55d462947aa?narHash=sha256-zfY4F4CpeUjTGgecIJZ%2BM7vFpwLc0Gm9epM/iMQd4w8%3D' (2025-10-15)
  → 'github:nix-community/home-manager/870883ba11ba1c84f756c0c1f9fa74cdb2a16c1e?narHash=sha256-OxGcFcQdfOK8veZkPdQuqXIotFYiy4sBQB58dMNLeHY%3D' (2025-10-18)
• Updated input 'nix-darwin':
    'github:LnL7/nix-darwin/9a9ab01072f78823ca627ae5e895e40d493c3ecf?narHash=sha256-IGwy02SH5K2hzIFrKMRsCmyvwOwWxrcquiv4DbKL1S4%3D' (2025-10-13)
  → 'github:LnL7/nix-darwin/c3211fcd0c56c11ff110d346d4487b18f7365168?narHash=sha256-aAHphQbU9t/b2RRy2Eb8oMv%2BI08isXv2KUGFAFn7nCo%3D' (2025-10-17)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/cf3f5c4def3c7b5f1fc012b3d839575dbe552d43?narHash=sha256-TK9Kr0BYBQ/1P5kAsnNQhmWWKgmZXwUQr4ZMjCzWf2c%3D' (2025-10-12)
  → 'github:nixos/nixpkgs/544961dfcce86422ba200ed9a0b00dd4b1486ec5?narHash=sha256-EVAqOteLBFmd7pKkb0%2BFIUyzTF61VKi7YmvP1tw4nEw%3D' (2025-10-15)

Author: github-actions[bot]