flake.lock: Update

Flake lock file updates:

• Updated input 'emacs-overlay':
    'github:nix-community/emacs-overlay/38e6edaa6d0aa316bd16042c76e5af93287b2512' (2024-02-16)
  → 'github:nix-community/emacs-overlay/d2209311614dd33e16284e5d20ee602fb6fb44a2' (2024-02-19)
• Updated input 'emacs-overlay/nixpkgs':
    'github:NixOS/nixpkgs/a4d4fe8c5002202493e87ec8dbc91335ff55552c' (2024-02-15)
  → 'github:NixOS/nixpkgs/5863c27340ba4de8f83e7e3c023b9599c3cb3c80' (2024-02-16)
• Updated input 'emacs-overlay/nixpkgs-stable':
    'github:NixOS/nixpkgs/c68a9fc85c2cb3a313be6ff40511635544dde8da' (2024-02-15)
  → 'github:NixOS/nixpkgs/84d981bae8b5e783b3b548de505b22880559515f' (2024-02-17)
• Updated input 'home-manager':
    'github:nix-community/home-manager/3d6791b3897b526c82920a2ab5f61d71985b3cf8' (2024-02-15)
  → 'github:nix-community/home-manager/a54e05bc12d88ff2df941d0dc1183cb5235fa438' (2024-02-18)
• Updated input 'neovim-nightly-overlay':
    'github:nix-community/neovim-nightly-overlay/1afaeebc41dab1029b855b17d78f2348e8dd49e3' (2024-02-16)
  → 'github:nix-community/neovim-nightly-overlay/886e4196fbf3eaaf292435deaffdc22f1aa1a3a0' (2024-02-19)
• Updated input 'neovim-nightly-overlay/neovim-flake':
    'github:neovim/neovim/04dfa2eea914086a9f42a5a00a33e9524f9fded4?dir=contrib' (2024-02-15)
  → 'github:neovim/neovim/8f1f2a1d9f6af56ae928f6cdc29055a0ba13baea?dir=contrib' (2024-02-18)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/a4d4fe8c5002202493e87ec8dbc91335ff55552c' (2024-02-15)
  → 'github:NixOS/nixpkgs/5863c27340ba4de8f83e7e3c023b9599c3cb3c80' (2024-02-16)