flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/878ef7d9721bee9f81f8a80819f9211ad1f993da' (2024-03-14)
  → 'github:NixOS/nixpkgs/f091af045dff8347d66d186a62d42aceff159456' (2024-03-20)
• Updated input 'sandkasten':
    'github:Defelo/sandkasten/ab0790ae0ca53a83947ef8fe00f47f0a89d6c7c4' (2024-03-14)
  → 'github:Defelo/sandkasten/3b3a28511f17fe24d71c4a625eba921077191c3b' (2024-03-21)
• Updated input 'sandkasten/fenix':
    'github:nix-community/fenix/24002092be13b2efe87700229d143b0d1eaa5d12' (2024-03-09)
  → 'github:nix-community/fenix/b06c3b4110bfb731d8b84b35cc5f7e00e63b37ed' (2024-03-16)
• Updated input 'sandkasten/fenix/nixpkgs':
    'github:nixos/nixpkgs/9df3e30ce24fd28c7b3e2de0d986769db5d6225d' (2024-03-06)
  → 'github:nixos/nixpkgs/d691274a972b3165335d261cc4671335f5c67de9' (2024-03-14)
• Updated input 'sandkasten/fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/2397e7a887252aa995d3790164b34b6c76ed94b4' (2024-03-08)
  → 'github:rust-lang/rust-analyzer/d7ec7a5441190b4fde399b2ac3a8d9daaf062e1c' (2024-03-15)
• Updated input 'sandkasten/nixpkgs':
    'github:NixOS/nixpkgs/d503ebacda199d03f06f71ff776545e53700ec84' (2024-03-10)
  → 'github:NixOS/nixpkgs/6dc11d9859d6a18ab0c5e5829a5b8e4810658de3' (2024-03-16)
• Updated input 'sandkasten/nixpkgs-master':
    'github:NixOS/nixpkgs/187a4d6ffc74a65cb55891a2d011fb9aacb4f6ec' (2024-03-10)
  → 'github:NixOS/nixpkgs/ec6f663ee793c285c5151c8adda7706ebbe27298' (2024-03-17)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/6c32d3b9c7593f4b466ec5404e59fc09a803a090' (2024-03-14)
  → 'github:Mic92/sops-nix/83b68a0e8c94b72cdd0a6e547a14ca7eb1c03616' (2024-03-17)
• Updated input 'sops-nix/nixpkgs':
    'github:NixOS/nixpkgs/0e7f98a5f30166cbed344569426850b21e4091d4' (2024-03-09)
  → 'github:NixOS/nixpkgs/9af9c1c87ed3e3ed271934cb896e0cdd33dae212' (2024-03-15)
• Updated input 'sops-nix/nixpkgs-stable':
    'github:NixOS/nixpkgs/b17375d3bb7c79ffc52f3538028b2ec06eb79ef8' (2024-03-10)
  → 'github:NixOS/nixpkgs/6dc11d9859d6a18ab0c5e5829a5b8e4810658de3' (2024-03-16)