flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/14a3a62bfca6c572b9a415cfa80cdbd7ad4326b3' -> 'github:NixOS/nix/2e4bd782115c5842781db31f6e06c162f8afe780'
  • Updated 'nix/nixpkgs': 'github:NixOS/nixpkgs/b88ff468e9850410070d4e0ccd68c7011f15b2be' -> 'github:NixOS/nixpkgs/70717a337f7ae4e486ba71a500367cad697e5f09'
  • Updated 'nixpkgs': 'github:NixOS/nixpkgs/29eddfc36d720dcc4822581175217543b387b1e8' -> 'github:NixOS/nixpkgs/a84b797b28eb104db758b5cb2b61ba8face6744b'

Created by  Eelco Dolstra  on June 17, 2020
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