flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/eb75282b8dc855983368c79cc4c2943c298518f7' -> 'github:NixOS/nix/2a8017092025a7c108ca1a829a8b4f0bcf7ee2c0'
  • Added 'nix/lowdown-src': 'github:edolstra/lowdown/c7a4e715af1e233080842db82d15b261cb74cb28'

Created by  Eelco Dolstra  on September 15, 2020
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