flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/6c64dabd3aa85e0c02ef1cdcb6e1213de64baee3?narHash=sha256-h/aac1dGLhS3qpaD2aZt25NdKY7b%2BJT0ZIP2WuGsJMU%3D' (2025-06-15)
  → 'github:NixOS/nixpkgs/b2485d56967598da068b5a6946dadda8bfcbcd37?narHash=sha256-3vkjFnxCOP6vm5Pm13wC/Zy6/VYgei/I/2DWgW4RFeA%3D' (2025-06-20)
• Updated input 'pyproject-nix':
    'github:nix-community/pyproject.nix/e09c10c24ebb955125fda449939bfba664c467fd?narHash=sha256-QxdHGNpbicIrw5t6U3x%2BZxeY/7IEJ6lYbvsjXmcxFIM%3D' (2025-05-06)
  → 'github:nix-community/pyproject.nix/e824458bd917b44bf4c38795dea2650336b2f55d?narHash=sha256-ThKBd8XSvITAh2JqU7enOp8AfKeQgf9u7zYC41cnBE4%3D' (2025-06-21)
• Updated input 'srvos':
    'github:nix-community/srvos/c4c51cca77838d2ae0cc4cea36dde3bc3eea57e6?narHash=sha256-ZwduydIUY0tdF1fLXPGeyNo24vYOhlR/w/r0hGp8OBs%3D' (2025-06-16)
  → 'github:nix-community/srvos/59e4d88787de0a2bdc58854566ab90419de73a06?narHash=sha256-BlsBuLi1YxJyYQFmSUesBZaMmPnfTzI2WbZhAbc20z8%3D' (2025-06-23)

Author: jhh