chore(nix): update flake.lock

Flake lock file updates:

• Updated input 'crane':
    'github:ipetkov/crane/ada0fb4dcce4561acb1eb17c59b7306d9d4a95f3' (2024-03-29)
  → 'github:ipetkov/crane/1e44708c0b34380085ba0cbabc230b8adbde1b3a' (2024-04-05)
• Updated input 'fenix':
    'github:nix-community/fenix/aaeaf4574767a0f5ed1787e990139aefcf4db103' (2024-03-30)
  → 'github:nix-community/fenix/569b5b5781395da08e7064e825953c548c26af76' (2024-04-05)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/f5a9250147f6569d8d89334dc9cca79c0322729f' (2024-03-29)
  → 'github:rust-lang/rust-analyzer/8e581ac348e223488622f4d3003cb2bd412bf27e' (2024-04-03)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089' (2024-03-29)
  → 'github:NixOS/nixpkgs/fd281bd6b7d3e32ddfa399853946f782553163b5' (2024-04-03)