flake.lock: Update (#1866)

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

```
Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d3baaf296366efdea6737124f05b65d1cf25fa7c?narHash=sha256-7QLUQZein1TbpouPOAsTka8vQLujHRmmTqze2IkdrqY%3D' (2025-10-06)
  → 'github:NixOS/nixpkgs/e18d8ec6fafaed55561b7a1b54eb1c1ce3ffa2c5?narHash=sha256-PO3cKHFIQEPI0dr/SzcZwG50cHXfjoIqP2uS5W78OXg%3D' (2025-10-11)
• Updated input 'released-nix-stable':
    'github:nixos/nix/fdea16241777b4a827d99436608b961960198785?narHash=sha256-NLGXPLjENLeKVOg3OZgHXZ%2B1x6sPIKq9FHH8pxbCrDI%3D' (2025-09-17)
  → 'github:nixos/nix/d069633b3df1db53b9724a5bb332f910d71c5daf?narHash=sha256-OOd7dFe0tX0CVPygR7U6cqs5fiJAvFO1el1QmjDG1GM%3D' (2025-10-07)
• Updated input 'released-nix-unstable':
    'github:nixos/nix/1e709554d565be51ab8d5a7e4941b0cc1da70807?narHash=sha256-xhNd/WR6/ZSNEJV%2B9MnZ31cHbk5NAvCG8j4gV1ucJPo%3D' (2025-10-06)
  → 'github:nixos/nix/97e770ad012232db5d6f1f537c290da99a963397?narHash=sha256-golZSAs/FLFn7otijXEnQ46TcHnGiqIKE5p9I/jN9eg%3D' (2025-10-11)
• Updated input 'released-nixpkgs-stable':
    'github:NixOS/nixpkgs/3bcc93c5f7a4b30335d31f21e2f1281cba68c318?narHash=sha256-YWo57PL7mGZU7D4WeKFMiW4ex/O6ZolUS6UNBHTZfkI%3D' (2025-10-04)
  → 'github:NixOS/nixpkgs/5da4a26309e796daa7ffca72df93dbe53b8164c7?narHash=sha256-wSK%2B3UkalDZRVHGCRikZ//CyZUJWDJkBDTQX1%2BG77Ow%3D' (2025-10-09)
• Updated input 'released-nixpkgs-unstable':
    'github:NixOS/nixpkgs/7df7ff7d8e00218376575f0acdcc5d66741351ee?narHash=sha256-gTrEEp5gEspIcCOx9PD8kMaF1iEmfBcTbO0Jag2QhQs%3D' (2025-10-02)
  → 'github:NixOS/nixpkgs/0b4defa2584313f3b781240b29d61f6f9f7e0df3?narHash=sha256-Oncbh0UmHjSlxO7ErQDM3KM0A5/Znfofj2BSzlHLeVw%3D' (2025-10-09)
```

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