Update flake.lock (#11492)

flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/6ed03ef4c8ec36d193c18e06b9ecddde78fb7e42?narHash=sha256-tl/0cnsqB/Yt7DbaGMel2RLa7QG5elA8lkaOXli6VdY%3D' (2025-08-19)
  → 'github:nix-community/fenix/9f42df6d931262bc814ef681bcac6de779bebaeb?narHash=sha256-1Eb53rxrULE1%2BMTHhxJTPNMwKKD6bkROd98L8LgMtCM%3D' (2025-08-30)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/a905e3b21b144d77e1b304e49f3264f6f8d4db75?narHash=sha256-VX0B9hwhJypCGqncVVLC%2BSmeMVd/GAYbJZ0MiiUn2Pk%3D' (2025-08-18)
  → 'github:rust-lang/rust-analyzer/67a58fdfebd72f4f9f737f2715ab21a260d88383?narHash=sha256-5U2p%2BgLtH17qtAZY1bdY0snoN/gRlQ8nH3LO%2BYw3hCk%3D' (2025-08-29)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/f937f8ecd1c70efd7e9f90ba13dfb400cf559de4?narHash=sha256-4/Jd%2BLkQ2ssw8luQVkqVs9spDBVE6h/u/hC/tzngsPo%3D' (2025-08-22)
  → 'github:NixOS/nixpkgs/a918bb3594dd243c2f8534b3be01b3cb4ed35fd1?narHash=sha256-ynQxPVN2FIPheUgTFhv01gYLbaiSOS7NgWJPm9LF9D0%3D' (2025-08-30)

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

Author: github-actions[bot]