Bump omz-custom/plugins/zsh-completions from 978e79e to 7a884c7

Bumps [omz-custom/plugins/zsh-completions](https://github.com/zsh-users/zsh-completions) from `978e79e` to `7a884c7`.
- [Release notes](https://github.com/zsh-users/zsh-completions/releases)
- [Commits](zsh-users/zsh-completions@978e79e...7a884c7)

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

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