flake.lock: Update (#202)

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/0087479649aab847e515e90e7f7333983dea798e' (2023-10-28)
  → 'github:nix-community/fenix/ec493cf412f94155daac4b95c95eb11ddcb347e5' (2023-11-04)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/46c395d57090f2ec5784d7fcad57a130911e44f7' (2023-10-26)
  → 'github:rust-lang/rust-analyzer/0fec61aabf62faab0c9f9b33b40ea5d5977792c8' (2023-11-03)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/c8f713806fd3a59133fc8cdb50267326830ed10d' (2023-10-28)
  → 'github:NixOS/nixpkgs/78f3a4ae19f0e99d5323dd2e3853916b8ee4afee' (2023-11-04)

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