flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/e0ca98c2071b815578470e280df8fdb750c7e23b' -> 'github:NixOS/nix/5e6eabe1551f3fa2a463fced39a4a48b504ed1ab'

Created by  Eelco Dolstra  on November 3, 2020
RERVUVS7U7ASVLJQFSFOTVSW4LBXD6ERPI4Z7WB4XYZTQCXFHLVQC
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