flake.lock: Update (#1876)

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

```
Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/4e627ac2e1b8f1de7f5090064242de9a259dbbc8?narHash=sha256-lbHQ7FXGzt6/IygWvJ1lCq%2BTxcut3xYYd6VIpF1ojkg%3D' (2025-10-18)
  → 'github:hercules-ci/flake-parts/864599284fc7c0ba6357ed89ed5e2cd5040f0c04?narHash=sha256-TmWcdiUUaWk8J4lpjzu4gCGxWY6/Ok7mOK4fIFfBuU4%3D' (2025-10-20)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/0a7d6b8a728a1aafce8bbdecad8fc25408db5fc4?narHash=sha256-6rxQDKJHcrQ70W9W%2BZ9K5ZIUbvsNZ2wa6OYe/jqp5iE%3D' (2025-10-18)
  → 'github:NixOS/nixpkgs/6a08e6bb4e46ff7fcbb53d409b253f6bad8a28ce?narHash=sha256-Q/uhWNvd7V7k1H1ZPMy/vkx3F8C13ZcdrKjO7Jv7v0c%3D' (2025-10-25)
• Updated input 'released-nix-unstable':
    'github:nixos/nix/b56e456b0df97b53fc889c441c6713c580bf4657?narHash=sha256-Kdt%2BH3F5jkJNJQ7BTErshMXkR2KJ11ZK6bxAJ9vTn04%3D' (2025-10-18)
  → 'github:nixos/nix/bef3c37cb2d92c2914d893106ae4ba87d94518b0?narHash=sha256-5nquKHrHKDh5D52CTFeqyPDfCVU/g77dULluMftnCBw%3D' (2025-10-25)
• Updated input 'released-nixpkgs-stable':
    'github:NixOS/nixpkgs/98ff3f9af2684f6136c24beef08f5e2033fc5389?narHash=sha256-/YdfibIrnqXAL8p5kqCU345mzpHoOtuVIkMiI2pF4Dc%3D' (2025-10-16)
  → 'github:NixOS/nixpkgs/c8aa8cc00a5cb57fada0851a038d35c08a36a2bb?narHash=sha256-m9W0dYXflzeGgKNravKJvTMR4Qqa2MVD11AwlGMufeE%3D' (2025-10-22)
• Updated input 'released-nixpkgs-unstable':
    'github:NixOS/nixpkgs/544961dfcce86422ba200ed9a0b00dd4b1486ec5?narHash=sha256-EVAqOteLBFmd7pKkb0%2BFIUyzTF61VKi7YmvP1tw4nEw%3D' (2025-10-15)
  → 'github:NixOS/nixpkgs/01f116e4df6a15f4ccdffb1bcd41096869fb385c?narHash=sha256-f/QCJM/YhrV/lavyCVz8iU3rlZun6d%2BdAiC3H%2BCDle4%3D' (2025-10-22)
```

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