Update flake.lock

Dependencies

• [2] 6LB22PZN Add a NixOS container to demo Hydra
• [3] CCPSI3TP Add flake.nix
• [4] JGWFBGDI Update flake.nix
• [5] GFT3FABQ Update lock file
• [6] M32RT6PS Update flake.{nix,lock}

Change contents

• replacement in flake.lock at line 18
  [3.567]→[2.0:216](∅→∅)
  − "narHash": "sha256-qWEM8iYRYUdaVCHwTq13w69/11hAFWZplp5mqeU2qBM=",

  − "originalUri": "nixpkgs/release-19.09",

  − "uri": "github:edolstra/nixpkgs/7d9219a0adea88942b8d609f89cf4a1f86df1a9c"
  [3.567]

  [3.157]
  + "narHash": "sha256-ltGlDPfwicH/u4orj1n4JXgRsA+jvKQsGnekObi0TV4=",

  + "originalUri": "nixpkgs/release-19.03",

  + "uri": "github:edolstra/nixpkgs/9a593b575e4044f9aff939b512e7cb1cf1e76a65"