Update to NixOS 20.09

Dependencies

• [2] 75BCCX2T Get rid of dependency to SQLite
• [3] V3VYVACM fix build after nix commit 82b77a77262c414044fffc7ad8b955ad91827995
• [4] 6TB64ZGT flake.lock: Update
• [5] RWNXH3H2 lastModified -> lastModifiedDate
• [6] NVWAU7WD flake.lock: Update
• [7] LYO7KK3J Address PR comments:
• [8] YBT5G74Q LDAP: add the required packages to the perlPackage via the overlay
• [9] KPWMZFHZ Add runHydra shell
• [10] QEFD45RS flake.lock: Update
• [11] 625P4XPS Update flake.lock
• [12] TFX3VUPC flake.lock: Update
• [*] CCPSI3TP Add flake.nix

Change contents

• replacement in flake.lock at line 55
  [4.660]→[3.696:806](∅→∅)
  − "lastModified": 1599903709,

  − "narHash": "sha256-tinVKY7zRdSXmVOp7BAulNtIb2iP5nvNp5UAxihKXNI=",
  [4.660]

  [4.660]
  + "lastModified": 1602230526,

  + "narHash": "sha256-3/ucBPYg42P+1ji5/7q227Ek/Eq2C7zeiB9sZl5UpIY=",
• replacement in flake.lock at line 59
  [4.713]→[3.807:866](∅→∅)
  − "rev": "252bfe0107587d40092057f338e9ffcf7bbd90cb",
  [4.713]

  [4.772]
  + "rev": "0b8799ecaaf0dc6b4c11583a3c96ca5b40fcfdfb",
• replacement in flake.lock at line 64
  [4.851]→[4.851:881](∅→∅)
  − "ref": "nixos-20.03",
  [4.851]

  [4.1372]
  + "ref": "nixos-20.09",
• replacement in flake.nix at line 4
  [4.81]→[4.81:127](∅→∅)
  − inputs.nixpkgs.url = "nixpkgs/nixos-20.03";
  [4.81]

  [4.127]
  + inputs.nixpkgs.url = "nixpkgs/nixos-20.09";
• replacement in flake.nix at line 165
  [2.683]→[4.3119:3208](∅→∅),[4.3119]→[4.3119:3208](∅→∅)
  − gitAndTools.topGit mercurial darcs subversion bazaar openssl bzip2 libxslt
  [2.683]

  [4.3208]
  + gitAndTools.topGit mercurial darcs subversion breezy openssl bzip2 libxslt
• replacement in flake.nix at line 180
  [2.752]→[4.3614:3710](∅→∅),[4.3614]→[4.3614:3710](∅→∅)
  − gzip bzip2 lzma gnutar unzip git gitAndTools.topGit mercurial darcs gnused bazaar
  [2.752]

  [4.3710]
  + gzip bzip2 lzma gnutar unzip git gitAndTools.topGit mercurial darcs gnused breezy
• edit in flake.nix at line 205
  [4.4329]

  [4.4329]
  + # set $HOME for bzr so it can create its trace file

  + export HOME=$(mktemp -d)