flake.lock: Update (#387)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/cff5aaed65d27c2802eb93e7cb854a7fe70f0a42?narHash=sha256-iODar05AGyn4t2N6F%2BLwSKCOaZDr8DMCu8AtsUvPGWw%3D' (2024-10-13)
  → 'github:nix-community/neovim-nightly-overlay/19773b896a25b0bf9cc113bd9709c1783b94485b?narHash=sha256-cdvOC7opKjAJyX9n1WZJei/j0RTuhVOJoJBfeWrHKWQ%3D' (2024-10-14)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/fb74fd2954ee4eeee566bb2fcfd480a4281f1e4a?narHash=sha256-UX/29CeEcbY1FsdzI4vAs23uP/iNAwRPjHtN3U0Llzs%3D' (2024-10-13)
  → 'github:neovim/neovim/36890824c7edb7bc5458062c14efbfa0b1d280b5?narHash=sha256-yPj2pPBLtKY/YqjY/iWC8fmU2LRdUBrIO5dcLpNPy6s%3D' (2024-10-13)

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