chore(deps): zsh-completions from 9dc9966 to b15cc8e (#911)

Bumps [custom/plugins/zsh-completions](https://github.com/clarketm/zsh-completions) from `9dc9966` to `b15cc8e`.
- [Release notes](https://github.com/clarketm/zsh-completions/releases)
- [Commits](clarketm/zsh-completions@9dc9966...b15cc8e)

---
updated-dependencies:
- dependency-name: custom/plugins/zsh-completions
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>