chore(deps): bump custom/plugins/zsh-completions

Bumps [custom/plugins/zsh-completions](https://github.com/clarketm/zsh-completions) from `8b78f35` to `9dc9966`.
- [Release notes](https://github.com/clarketm/zsh-completions/releases)
- [Commits](clarketm/zsh-completions@8b78f35...9dc9966)

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

Signed-off-by: dependabot[bot] <[email protected]>