flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/79aa7d95183cbe6c0d786965f0dbff414fd1aa67' -> 'github:NixOS/nix/8a2ce0f455da32bc20978e68c0aad9efb4560abc'

Created by  Eelco Dolstra  on January 3, 2021
7WHTSDWPMMF7VKWWFKIM74NEKT7RGHVR3CUAI2YFDGQGQD4B7BIAC
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