flake.lock: Update

Flake lock file updates:

• Updated input 'darwin':
    'github:LnL7/nix-darwin/550340062c16d7ef8c2cc20a3d2b97bcd3c6b6f6' (2024-03-07)
  → 'github:LnL7/nix-darwin/bcc8afd06e237df060c85bad6af7128e05fd61a3' (2024-03-17)
• Updated input 'devshell':
    'github:numtide/devshell/5ddecd67edbd568ebe0a55905273e56cc82aabe3' (2024-02-26)
  → 'github:numtide/devshell/bc68b058dc7e6d4d6befc4ec6c60082b6e844b7d' (2024-03-11)
• Updated input 'flake-utils':
    'github:numtide/flake-utils/d465f4819400de7c8d874d50b982301f28a84605' (2024-02-28)
  → 'github:numtide/flake-utils/b1d9ab70662946ef0850d488da1c9019f3a9752a' (2024-03-11)
• Updated input 'home-manager-unstable':
    'github:nix-community/home-manager/17431970b4ebc75a92657101ccffcfc9e1f9d8f0' (2024-03-08)
  → 'github:nix-community/home-manager/022464438a85450abb23d93b91aa82e0addd71fb' (2024-03-19)
• Updated input 'nixos-hardware':
    'github:nixos/nixos-hardware/59e37017b9ed31dee303dbbd4531c594df95cfbc' (2024-03-02)
  → 'github:nixos/nixos-hardware/1e679b9a9970780cd5d4dfe755a74a8f96d33388' (2024-03-18)
• Updated input 'nixos-mailserver':
    'gitlab:simple-nixos-mailserver/nixos-mailserver/572c1b4d69deea1093ac231c37927cfa8ccad477' (2024-03-08)
  → 'gitlab:simple-nixos-mailserver/nixos-mailserver/79c8cfcd5873a85559da6201b116fb38b490d030' (2024-03-14)
• Updated input 'nixos-mailserver/flake-compat':
    'github:edolstra/flake-compat/009399224d5e398d03b22badca40a37ac85412a1' (2022-11-17)
  → 'github:edolstra/flake-compat/0f9255e01c2351cc7d116c072cb317785dd33b33' (2023-10-04)
• Removed input 'nixos-mailserver/nixpkgs-23_05'
• Removed input 'nixos-mailserver/nixpkgs-23_11'
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/2be119add7b37dc535da2dd4cba68e2cf8d1517e' (2024-03-08)
  → 'github:nixos/nixpkgs/fa9f817df522ac294016af3d40ccff82f5fd3a63' (2024-03-19)
• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/9df3e30ce24fd28c7b3e2de0d986769db5d6225d' (2024-03-06)
  → 'github:nixos/nixpkgs/b06025f1533a1e07b6db3e75151caa155d1c7eb3' (2024-03-19)
• Updated input 'nur':
    'github:nix-community/NUR/7d1f369d01ee0eb3e05fd1b9fb25e73992df625b' (2024-03-09)
  → 'github:nix-community/NUR/c6ebb89c8d8cfc4fb994347c3fb5dd7719f4e2e9' (2024-03-20)