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

Bumps [custom/plugins/zsh-completions](https://github.com/clarketm/zsh-completions) from `d2b2875` to `5999c3a`.
- [Release notes](https://github.com/clarketm/zsh-completions/releases)
- [Commits](clarketm/zsh-completions@d2b2875...5999c3a)

---
updated-dependencies:
- dependency-name: custom/plugins/zsh-completions
  dependency-version: 5999c3acf8c69d5e7fe0e04f8c32bc3abf797f55
  dependency-type: direct:production
...

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Author: dependabot[bot]