flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/25db7a6f4de7dea678620785e03fbc4560c00672?narHash=sha256-wC9PR%2BrPjmcpnPdOIDwyNwQiRhNsuDs3oZY3t42f4uA%3D' (2025-07-26)
  → 'github:nix-community/fenix/73494b26b031328fd959e7a3da0f9fdc8957d86c?narHash=sha256-YYIsyGsTiQ2aKoEmYaqRqe44yE3TjpzirR35Cqj50LU%3D' (2025-09-27)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/51e77c9d7b9b99f7a230bf5179ef1343befd71ac?narHash=sha256-5XbVpJwiy%2Bsw1v4PXSAz4lgJnVna6xkzqyZtoHymFJA%3D' (2025-07-25)
  → 'github:rust-lang/rust-analyzer/f5e049d09dc17d0b61de2ec179b3607cf1e431b2?narHash=sha256-wxOmbk6MH6qgvShZUrD7pJnM7m2lFaoBeVJjVoNeVT8%3D' (2025-09-26)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/6027c30c8e9810896b92429f0092f624f7b1aace?narHash=sha256-cnL5WWn/xkZoyH/03NNUS7QgW5vI7D1i74g48qplCvg%3D' (2025-07-25)
  → 'github:NixOS/nixpkgs/e3a3b32cc234f1683258d36c6232f150d57df015?narHash=sha256-hEIDTaIqvW1NMfaNgz6pjhZPZKTmACJmXxGr/H6isIg%3D' (2025-09-27)

Author: github-actions[bot]