flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/1458349a1bd55105f917e962dca4b328ac0a55e8?narHash=sha256-P9VX/P2mN96MkFN8hwCYUQ%2BLV1bfH57UJ/pGwjd0Olc%3D' (2025-09-13)
  → 'github:nix-community/fenix/2579f163559b902959cc420a6d3bfbd98c46a323?narHash=sha256-yxcfwZCysR6zPaFv7is3/FWd1h0h6kXME0vueSwTBhU%3D' (2025-10-11)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/9edc9cbe5d8e832b5864e09854fa94861697d2fd?narHash=sha256-/PAhxheUq4WBrW5i/JHzcCqK5fGWwLKdH6/Lu1tyS18%3D' (2025-09-08)
  → 'github:rust-lang/rust-analyzer/b93180b4f2cb3c81ac7f17f46e3dfcb30ecc7843?narHash=sha256-XGkBjf4Dzg6tXd0KGgKzeW4oVX/iLzLhD3rQ1cATpqM%3D' (2025-10-10)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/6d7ec06d6868ac6d94c371458fc2391ded9ff13d?narHash=sha256-fEvTiU4s9lWgW7mYEU/1QUPirgkn%2BodUBTaindgiziY%3D' (2025-09-13)
  → 'github:NixOS/nixpkgs/870493f9a8cb0b074ae5b411b2f232015db19a65?narHash=sha256-BMsGVfKl4Q80Pr9T1AkCRljO1bpwCmY8rTBVj8XGuhA%3D' (2025-10-10)

Author: github-actions[bot]