flake.lock: Update

Flake lock file changes:

• Updated input 'flake-compat':
    'github:edolstra/flake-compat/99f1c2157fba4bfe6211a321fd0ee43199025dbf' (2020-11-26)
  → 'github:edolstra/flake-compat/12c64ca55c1014cdc1b16ed5a804aa8576601ff2' (2021-08-02)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d8eb97e3801bde96491535f40483d550b57605b9' (2021-06-06)
  → 'github:NixOS/nixpkgs/e0ce3c683ae677cf5aab597d645520cddd13392b' (2021-09-19)
• Updated input 'utils':
    'github:numtide/flake-utils/7d706970d94bc5559077eb1a6600afddcd25a7c8' (2021-05-31)
  → 'github:numtide/flake-utils/7e5bf3925f6fbdfaf50a2a7ca0be2879c4261d19' (2021-09-13)

Author: balsoft