Update flake.lock (#11970)

flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/73494b26b031328fd959e7a3da0f9fdc8957d86c?narHash=sha256-YYIsyGsTiQ2aKoEmYaqRqe44yE3TjpzirR35Cqj50LU%3D' (2025-09-27)
  → 'github:nix-community/fenix/6ffcbf59c119b0c6384c7d98f18cea06a9af7e9c?narHash=sha256-J/rtMKVUAEqOFj0ogvcHKK8HbaKhw%2BtiNrDOpEM%2BZDY%3D' (2025-10-04)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/f5e049d09dc17d0b61de2ec179b3607cf1e431b2?narHash=sha256-wxOmbk6MH6qgvShZUrD7pJnM7m2lFaoBeVJjVoNeVT8%3D' (2025-09-26)
  → 'github:rust-lang/rust-analyzer/472037b789cf593172d6adf3b8d9f7a429f6cd9b?narHash=sha256-7StxDed3v2fAWLkl%2BHse9FlpjT7Dk7Cn/4vxTFyEhIg%3D' (2025-10-01)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/53614373268559d054c080d070cfc732dbe68ac4?narHash=sha256-fB2ISCc%2Bxn%2B9hZ6gOsABxSBcsCgLCjbJ5bC6U9bPzQ4%3D' (2025-09-26)
  → 'github:NixOS/nixpkgs/27ac93958969b5f3dccd654b402599cf3de633ac?narHash=sha256-hhM8SUI6kQMei5TImFdNQy9EDT8g2hAD161DUtbfAy0%3D' (2025-10-04)

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

Author: github-actions[bot]