refactor(bash/bashrc): delete caskroom-update functions
refactor(bash/bashrc): delete caskroom-update functions

- delete the following 3 functions:
  - `caskroom-update-cask`
  - `caskroom-update-fonts`
  - `caskroom-update-versions`
- The `cask-repair` command of `vitorgalvao/tiny-scripts` no longer
  requires multiple steps to perform an update for a cask formula; see
  more about this at https://github.com/vitorgalvao/tiny-scripts/pull/56

shoichiaizawa/dotfiles,shoichiaizawa/dotfiles,shoichiaizawa/dotfiles