Update submodules

M  .oh-my-zsh
M  .vim/bundle/vim-fugitive
M  .vim/bundle/vim-gnupg

Automatically generated:
  source: Gitlab CI
  runner: bth-tower01/1 (11.11.0)
  job:    https://code.kodo.org.uk/dom/dotfiles/-/jobs/1048 (#1048)
  time:   Sun Jun  2 04:28:13 UTC 2019