flake.lock: Update (#1329)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/7df7ff7d8e00218376575f0acdcc5d66741351ee?narHash=sha256-gTrEEp5gEspIcCOx9PD8kMaF1iEmfBcTbO0Jag2QhQs%3D' (2025-10-02)
  → 'github:NixOS/nixpkgs/0b4defa2584313f3b781240b29d61f6f9f7e0df3?narHash=sha256-Oncbh0UmHjSlxO7ErQDM3KM0A5/Znfofj2BSzlHLeVw%3D' (2025-10-09)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/bd3a63bbff2c4cb3cd48e9d49f54c2ccad457f70?narHash=sha256-yQwP0JOHi3Icq09GG5ufGuGrq2zIijglVFj3kkF2MHA%3D' (2025-10-04)
  → 'github:oxalica/rust-overlay/a8143c74e5ed8cdbca3c96d4362b6392577481ff?narHash=sha256-FVVS5YgOFQHa8waL9EoUuw29iaDIF0qRkVlXIaU1j%2Bc%3D' (2025-10-11)

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

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