flake.lock: Update

Flake lock file updates:

• Updated input 'sandkasten':
    'github:Defelo/sandkasten/57845688015ff8ca7fae04d39ff736c57da106bb' (2024-04-21)
  → 'github:Defelo/sandkasten/71cfcb3195fa7f08175a10f29e26e689c9ca303b' (2024-05-02)
• Updated input 'sandkasten/fenix':
    'github:nix-community/fenix/3247290e1bba55878a2c62d43894d0309d29c918' (2024-04-20)
  → 'github:nix-community/fenix/055f6db376eaf544d84aa55bd5a7c70634af41ba' (2024-04-27)
• Updated input 'sandkasten/fenix/nixpkgs':
    'github:nixos/nixpkgs/5c24cf2f0a12ad855f444c30b2421d044120c66f' (2024-04-19)
  → 'github:nixos/nixpkgs/7bb2ccd8cdc44c91edba16c48d2c8f331fb3d856' (2024-04-25)
• Updated input 'sandkasten/fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/c83d8cf5844fff3d6e243ab408669222059af1c6' (2024-04-19)
  → 'github:rust-lang/rust-analyzer/1ed7e2de05ee76f6ae83cc9c72eb0b33ad6903f2' (2024-04-26)
• Updated input 'sandkasten/nixpkgs':
    'github:NixOS/nixpkgs/74574c38577914733b4f7a775dd77d24245081dd' (2024-04-20)
  → 'github:NixOS/nixpkgs/dd403667d37b8822efa205c37fb1375e4c9805fa' (2024-04-27)
• Updated input 'sandkasten/nixpkgs-master':
    'github:NixOS/nixpkgs/754a00b38a44e774dba3518ced7efbf51a8970ba' (2024-04-20)
  → 'github:NixOS/nixpkgs/a2acec635dd260d8bfeb7c178f17c75d70056ac5' (2024-04-28)

Author: Defelo