flake/dev/flake.lock: apply changes from #3121

Apply changes from 8e732cf (#3121)

Flake lock file updates:

• Added input 'dev-nixpkgs':
    'github:NixOS/nixpkgs/1750f3c1c89488e2ffdd47cab9d05454dddfb734?narHash=sha256-oDJGK1UMArK52vcW9S5S2apeec4rbfNELgc50LqiPNs%3D' (2025-03-24)
• Updated input 'devshell/nixpkgs':
    follows 'nixpkgs'
  → follows 'dev-nixpkgs'
• Updated input 'git-hooks/nixpkgs':
    follows 'nixpkgs'
  → follows 'dev-nixpkgs'
• Updated input 'home-manager/nixpkgs':
    follows 'nixpkgs'
  → follows 'dev-nixpkgs'
• Updated input 'nix-darwin/nixpkgs':
    follows 'nixpkgs'
  → follows 'dev-nixpkgs'
• Removed input 'nixpkgs'
• Updated input 'treefmt-nix/nixpkgs':
    follows 'nixpkgs'
  → follows 'dev-nixpkgs'

Author: MattSturgeon