feat: update flake.lock (#81)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/7a2622e2c0dbad5c4493cb268aba12896e28b008?narHash=sha256-MHmBH2rS8KkRRdoU/feC/dKbdlMkcNkB5mwkuipVHeQ%3D' (2025-05-03)
  → 'github:nixos/nixpkgs/dda3dcd3fe03e991015e9a74b22d35950f264a54?narHash=sha256-Ua0drDHawlzNqJnclTJGf87dBmaO/tn7iZ%2BTCkTRpRc%3D' (2025-05-08)

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

Author: github-actions[bot]