flake: update inputs (#414)

Flake lock file updates:

• Updated input 'nixpkgs-stable':
    'github:NixOS/nixpkgs/c505ebf777526041d792a49d5f6dd4095ea391a7?narHash=sha256-r%2BSF9AnHrTg%2Bbk6YszoKfV9lgyw%2ByaFUQe0dOjI0Z2o%3D' (2024-10-11)
  → 'github:NixOS/nixpkgs/a3f9ad65a0bf298ed5847629a57808b97e6e8077?narHash=sha256-u%2BrxA79a0lyhG%2Bu%2BoPBRtTDtzz8kvkc9a6SWSt9ekVc%3D' (2024-10-12)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/fc1e58ebabe0cef4442eedea07556ff0c9eafcfe?narHash=sha256-Ox1pvEHxLK6lAdaKQW21Zvk65SPDag%2BcD8YA444R/og%3D' (2024-10-12)
  → 'github:oxalica/rust-overlay/174a8d9cec9e2c23877a7b887c52b68ef0421d8b?narHash=sha256-qY%2B1e0o6oV5ySlErhj/dsWsPLWjrMKzq4QI7a1t9/Ps%3D' (2024-10-13)

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