virtualbox: 5.2.10 -> 5.2.12

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/virtualbox/versions.

These checks were done:

- built on NixOS
- ran ‘/nix/store/6769l9s88jlcv3qgxpjsfr1ybkq3yvvb-virtualbox-5.2.12/bin/VBoxManage -h’ got 0 exit code
- ran ‘/nix/store/6769l9s88jlcv3qgxpjsfr1ybkq3yvvb-virtualbox-5.2.12/bin/VBoxManage --help’ got 0 exit code
- ran ‘/nix/store/6769l9s88jlcv3qgxpjsfr1ybkq3yvvb-virtualbox-5.2.12/bin/VBoxManage help’ got 0 exit code
- ran ‘/nix/store/6769l9s88jlcv3qgxpjsfr1ybkq3yvvb-virtualbox-5.2.12/bin/VBoxBalloonCtrl -h’ got 0 exit code
- ran ‘/nix/store/6769l9s88jlcv3qgxpjsfr1ybkq3yvvb-virtualbox-5.2.12/bin/VBoxBalloonCtrl --help’ got 0 exit code
- found 5.2.12 with grep in /nix/store/6769l9s88jlcv3qgxpjsfr1ybkq3yvvb-virtualbox-5.2.12
- directory tree listing: https://gist.github.com/f9bf852a0a8e6e0b4c44a9b68764850b

pkgs/applications/virtualization/virtualbox/default.nix

@@ -23,8 +23,8 @@ let
   # Do not forget to update the hash in ./guest-additions/default.nix!
   extpack = "5eef217dbe0a8e8caf383ea8db83344517af0f9093041b5345c8468a427b327b";
   extpackRev = "122406";
-  main = "1k14ngz1gcz02qwbpzfp4kgxv8s24js8pwd5nyyqs6jpxx6557pd";
-  version = "5.2.10";
+  main = "0n1lip8lkz4qqq5ml47xldsx41919ncfh060i7yj51bhas604q6s";
+  version = "5.2.12";
 
   # See https://github.com/NixOS/nixpkgs/issues/672 for details
   extensionPack = requireFile rec {