chore: update flake.lock

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/44bae27' (2026-03-09)
  → 'github:NixOS/nixpkgs/e9f278f' (2026-03-14)
• Updated input 'pyproject-build-systems':
    'github:pyproject-nix/build-system-pkgs/c37f66a' (2026-03-03)
  → 'github:pyproject-nix/build-system-pkgs/749899c' (2026-03-16)
• Updated input 'pyproject-nix':
    'github:pyproject-nix/pyproject.nix/10ebca8' (2026-03-11)
  → 'github:pyproject-nix/pyproject.nix/3799d59' (2026-03-15)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/1924b46' (2026-03-10)
  → 'github:oxalica/rust-overlay/f600ea4' (2026-03-16)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/3710e0e' (2026-03-04)
  → 'github:numtide/treefmt-nix/71b125c' (2026-03-12)
• Updated input 'uv2nix':
    'github:pyproject-nix/uv2nix/b68be7c' (2026-03-09)
  → 'github:pyproject-nix/uv2nix/27b135e' (2026-03-12)

Author: github-actions[bot]