flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/bfb7a882678e518398ce9a31a881538679f6f092?narHash=sha256-4zSIhSRRIoEBwjbPm3YiGtbd8HDWzFxJjw5DYSDy1n8%3D' (2024-05-24)
  → 'github:nixos/nixpkgs/ad57eef4ef0659193044870c731987a6df5cf56b?narHash=sha256-SzDKxseEcHR5KzPXLwsemyTR/kaM9whxeiJohbL04rs%3D' (2024-05-29)
• Removed input 'poetry2nixFlake'
• Removed input 'poetry2nixFlake/flake-utils'
• Removed input 'poetry2nixFlake/flake-utils/systems'
• Removed input 'poetry2nixFlake/nix-github-actions'
• Removed input 'poetry2nixFlake/nix-github-actions/nixpkgs'
• Removed input 'poetry2nixFlake/nixpkgs'
• Removed input 'poetry2nixFlake/systems'
• Removed input 'poetry2nixFlake/treefmt-nix'
• Removed input 'poetry2nixFlake/treefmt-nix/nixpkgs'
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/4d0f1e4d5d65c23cdbb77e4b0d91940be7309bd4?narHash=sha256-81u/zd7V%2BXRTq88zwRLxw5GnwZyEiAvGA2BvAXUe864%3D' (2024-05-25)
  → 'github:oxalica/rust-overlay/ab69b67fac9a96709fbef0b899db308ca714a120?narHash=sha256-4gVhbC%2BNjSQ4c6cJvJGNCI1oTcD%2B8jRRNAnOF9faGCE%3D' (2024-06-01)