flake.lock: Update (#6402)
Flake lock file updates:
• Updated input 'nixpkgs':
'github:NixOS/nixpkgs/44d0940ea560dee511026a53f0e2e2cde489b4d4' (2024-03-23)
→ 'github:NixOS/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089' (2024-03-29)
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
