flake.lock: Update (#1485)

Flake lock file updates:

• Updated input 'hls':
    'github:haskell/haskell-language-server/97aac543bc0c80dc3c1760f716653789859a9535?narHash=sha256-S4MbycLTpZ4GFU0dGjKqsl0eryjC6ZOkUM%2BZKcgdu4c%3D' (2024-04-10)
  → 'github:haskell/haskell-language-server/9593d04a76e024942981b1333bfb2558a6ae0dab?narHash=sha256-ku8uTv5qnQCyDMhcoDFBATAxsnMRN0lDdh2Ee%2BIDn0k%3D' (2024-04-17)
• Updated input 'nixpkgs23_11':
    'github:NixOS/nixpkgs/c27f3b6d8e29346af16eecc0e9d54b1071eae27e?narHash=sha256-RifMwYuKu5v6x6O65msKDTqKkQ9crGwOB7yr20qMEuE%3D' (2024-04-13)
  → 'github:NixOS/nixpkgs/74574c38577914733b4f7a775dd77d24245081dd?narHash=sha256-q7APLfB6FmmSMI1Su5ihW9IwntBsk2hWNXh8XtSdSIk%3D' (2024-04-20)
• Updated input 'nixpkgsMaster':
    'github:NixOS/nixpkgs/6da46d61baddebc5b8e6c6b17df1cd61c30859fc?narHash=sha256-pgqruE%2BFJzbPRBwUv6CPdjaEPBICJReO4/eyv%2BQDIoQ%3D' (2024-04-14)
  → 'github:NixOS/nixpkgs/754a00b38a44e774dba3518ced7efbf51a8970ba?narHash=sha256-5zVIy90Uc5LzE7rt4x7LLZZWoYVM5g40QQlAxqc7BDc%3D' (2024-04-20)

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