chore: update git-cipher submodule
chore: update git-cipher submodule

* vendor/git-cipher 1dc39d6...468124a (3):
  > doc: add notes about usage on Arch Linux
  > doc: update CHANGELOG
  > fix: allow `command` built-in to work on Linux

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent