[chore] flake.lock: update inputs

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/e65aa8301ba4f0ab8cb98f944c14aa9da07394f8' (2024-09-11)
  → 'github:NixOS/nixpkgs/8f7492cce28977fbf8bd12c72af08b1f6c7c3e49' (2024-09-14)
• Updated input 'nixvim':
    'github:nix-community/nixvim/61be7a6eed7b6e70db9731cdf32d6a3e163cee73' (2024-09-15)
  → 'github:nix-community/nixvim/95b322a5220744a5cac725e62fa4e612851edbc2' (2024-09-15)
• Updated input 'nixvim/nuschtosSearch':
    'github:NuschtOS/search/4267d5c5b51591a9553eefbd12172da050ee3433' (2024-09-13)
  → 'github:NuschtOS/search/97d34b70deed4878fcb2449ac89dab717d72efa1' (2024-09-15)
• Updated input 'unstable':
    'github:NixOS/nixpkgs/4f807e8940284ad7925ebd0a0993d2a1791acb2f' (2024-09-11)
  → 'github:NixOS/nixpkgs/345c263f2f53a3710abe117f28a5cb86d0ba4059' (2024-09-13)