flake.lock: Update

Flake lock file updates:

• Updated input 'emacs-overlay':
    'github:nix-community/emacs-overlay/94b6e68490568844771f136728d551af61c3f0bb' (2024-01-05)
  → 'github:nix-community/emacs-overlay/475d3b2df3e517d96b60bfa08bf7dfe226b51d5e' (2024-01-08)
• Updated input 'emacs-overlay/nixpkgs-stable':
    'github:NixOS/nixpkgs/b0b2c5445c64191fd8d0b31f2b1a34e45a64547d' (2024-01-03)
  → 'github:NixOS/nixpkgs/c1be43e8e837b8dbee2b3665a007e761680f0c3d' (2024-01-05)
• Updated input 'home-manager':
    'github:nix-community/home-manager/26b8adb300e50efceb51fff6859a1a6ba1ade4f7' (2024-01-04)
  → 'github:nix-community/home-manager/51e44a13acea71b36245e8bd8c7db53e0a3e61ee' (2024-01-05)
• Updated input 'neovim-nightly-overlay':
    'github:nix-community/neovim-nightly-overlay/e458af36fdb3d814c78989197f09271b3d3c9122' (2024-01-05)
  → 'github:nix-community/neovim-nightly-overlay/688360dd650feff8fef1d5a539eede840ec07d14' (2024-01-08)
• Updated input 'neovim-nightly-overlay/neovim-flake':
    'github:neovim/neovim/88eb0ad149d353c475455e4013cafa6db2a3f9f1?dir=contrib' (2024-01-04)
  → 'github:neovim/neovim/367e52cc79a786bbee4456b30f9ec5db7e28d6a5?dir=contrib' (2024-01-07)