flake.lock: Update (#496)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/84b1159a837463590e8a057a90fefa6225b8679c?narHash=sha256-RQZ8LBTsBkorO6uKILjO28i5I2GdyEU0fe3HAS5rrB0%3D' (2025-02-16)
  → 'github:nix-community/neovim-nightly-overlay/aff85a1e85e3e17845b7babb72dbe92fedc2945e?narHash=sha256-jdzk%2B4r3xzHF6FvsPjGaxzQMNBYtrBOg9daTdCiLz7A%3D' (2025-02-17)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/a49f95d887a2425f11cb4a9b38f7b0039e4d837f?narHash=sha256-QJ%2B5C6/6SncQkx%2BQ/IEKeAqxbRqf5ihEQIBwEwggcrI%3D' (2025-02-15)
  → 'github:neovim/neovim/a75b09019f51d740f0890d881c90e140581f13e8?narHash=sha256-mPvdnIPFbEDe5Zqv6g6%2BccSSW77CnpqcGpqwUWo4Pjk%3D' (2025-02-16)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/1128e89fd5e11bb25aedbfc287733c6502202ea9?narHash=sha256-3ebRdThRic9bHMuNi2IAA/ek9b32bsy8F5R4SvGTIog%3D' (2025-02-13)
  → 'github:NixOS/nixpkgs/fada727ee7c0bd487e311dede0a2b0725a0f7765?narHash=sha256-Zc%2BK4AxAwFaWKK18nSl/3TKidGf46En7bfK8SL%2BRevg%3D' (2025-02-14)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/1dcdd535fef84d4671129a10e7072d56dca9a4d3?narHash=sha256-6QWdUgz2O2Mm%2BpYx/AYB4Rot5/s1OR1C6bt30TI81yY%3D' (2025-02-16)
  → 'github:nixos/nixpkgs/f0204ef4baa3b6317dee1c84ddeffbd293638836?narHash=sha256-oAgAV4fLWMIPqsEyZVVdk7c0SUdDOV1E7Epq0EIUQs4%3D' (2025-02-16)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>