chore: update flake.lock (#510)

Automated changes by the
[update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock)
GitHub Action.

```
Flake lock file updates:

• Updated input 'neorocks':
    'github:nvim-neorocks/neorocks/791842c8e19324475876ab0d1107546930982e7a?narHash=sha256-2kiwbSoJJxcrsaKI5U6yhAhyviBDWyHE0rBocmW0jag%3D' (2025-10-04)
  → 'github:nvim-neorocks/neorocks/4811c2848ce4f5de096e0907d8a086449f0f01ad?narHash=sha256-N1RxFW/miO7lpVnXYFMvVHhH4sIVBiHrqsANB97/8UE%3D' (2025-10-11)
• Updated input 'neorocks/neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/fb58686fa7a411ad0818d2c86ee210ccafc2b409?narHash=sha256-jYsR/51FszWZt1Y4WgjqZfjzIs%2BBLc31pHgwZnT1fS4%3D' (2025-10-04)
  → 'github:nix-community/neovim-nightly-overlay/a7445585f3caff995d6aa62bdb5a29fb45639fce?narHash=sha256-aIAdEUaNE/J%2BDdH7qstr6D8QgRT0R8sCsDg8HvV1qkI%3D' (2025-10-10)
• Updated input 'neorocks/neovim-nightly/neovim-src':
    'github:neovim/neovim/b6b80824cc71fb9f32ddf2e9a96205633342827e?narHash=sha256-UINKl0e0HbazbxjrP5Btv/RXOSPoIFCaLNOwLZ%2BI714%3D' (2025-10-03)
  → 'github:neovim/neovim/b1c41a332d183c4cb003329f7c2a3f310f48273c?narHash=sha256-7DSxZwD34xJRI/6koseN0QCTAH/BBWu8r2D2Cd3cWaU%3D' (2025-10-09)
• Updated input 'neorocks/neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/dc704e6102e76aad573f63b74c742cd96f8f1e6c?narHash=sha256-O7eHcgkQXJNygY6AypkF9tFhsoDQjpNEojw3eFs73Ow%3D' (2025-10-02)
  → 'github:NixOS/nixpkgs/2dad7af78a183b6c486702c18af8a9544f298377?narHash=sha256-LYr4IDfuihCkFAkSYz5//gT2r1ewcWBYgd5AxPzPLIo%3D' (2025-10-09)
• Updated input 'neorocks/nixpkgs':
    'github:nixos/nixpkgs/dc704e6102e76aad573f63b74c742cd96f8f1e6c?narHash=sha256-O7eHcgkQXJNygY6AypkF9tFhsoDQjpNEojw3eFs73Ow%3D' (2025-10-02)
  → 'github:nixos/nixpkgs/2dad7af78a183b6c486702c18af8a9544f298377?narHash=sha256-LYr4IDfuihCkFAkSYz5//gT2r1ewcWBYgd5AxPzPLIo%3D' (2025-10-09)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/27ac93958969b5f3dccd654b402599cf3de633ac?narHash=sha256-hhM8SUI6kQMei5TImFdNQy9EDT8g2hAD161DUtbfAy0%3D' (2025-10-04)
  → 'github:nixos/nixpkgs/870493f9a8cb0b074ae5b411b2f232015db19a65?narHash=sha256-BMsGVfKl4Q80Pr9T1AkCRljO1bpwCmY8rTBVj8XGuhA%3D' (2025-10-10)
```

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Author: mrcjkb