flake.lock: Update (#49)

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/b78c98c53a46e2a2d6479a920f98aa0aeae56281' (2024-07-07)
  → 'github:nix-community/fenix/e761b522381d124fdc3ba20cecb2be2abec1d8cf' (2024-07-14)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/058c88da66797eb588b47a4aac3e42847d1333d7' (2024-07-06)
  → 'github:rust-lang/rust-analyzer/ffbc5ad993d5cd2f3b8bcf9a511165470944ab91' (2024-07-11)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/9f4128e00b0ae8ec65918efeba59db998750ead6' (2024-07-03)
  → 'github:nixos/nixpkgs/7e7c39ea35c5cdd002cd4588b03a3fb9ece6fad9' (2024-07-12)
• Updated input 'poetry2nix':
    'github:nix-community/poetry2nix/42262f382c68afab1113ebd1911d0c93822d756e' (2024-07-01)
  → 'github:nix-community/poetry2nix/7f304a86324aea2026e65e508c82af7127f9b00d' (2024-07-15)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>