flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.614481%2Brev-5c24cf2f0a12ad855f444c30b2421d044120c66f/018efa00-a443-7f41-b371-ce568b5c7e9f/source.tar.gz?narHash=sha256-XtTSSIB2DA6tOv%2Bl0FhvfDMiyCmhoRbNB%2B0SeInZkbk%3D' (2024-04-19)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.637149%2Brev-c7b821ba2e1e635ba5a76d299af62821cbcb09f3/01900650-b12e-73f5-9410-f6d68ed2d4cb/source.tar.gz?narHash=sha256-GTO3C88%2B5DX171F/gVS3Qga/hOs/eRMxPFpiHq2t%2BD8%3D' (2024-06-09)