Update submodules

M  .oh-my-zsh
M  .shell/upstream/git-scripts
M  .vim/bundle/vim-fugitive
M  .vim/bundle/vim-python-fold

Automatically generated:
  source: Gitlab CI
  runner: bth-tower01/2 (11.10.1)
  job:    https://code.kodo.org.uk/dom/dotfiles/-/jobs/817 (#817)
  time:   Sun May 12 04:21:12 UTC 2019