Update dependency gulp-zip to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-zip	5.1.0 -> 6.0.0

---

Release Notes

sindresorhus/gulp-zip (gulp-zip)

### [`v6.0.0`](https://togithub.com/sindresorhus/gulp-zip/releases/tag/v6.0.0) [Compare Source](https://togithub.com/sindresorhus/gulp-zip/compare/v5.1.0...v6.0.0) ##### Breaking - Require Node.js 18 [`ccd0a32`](https://togithub.com/sindresorhus/gulp-zip/commit/ccd0a32) - This package is now pure ESM. **Please [read this](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).**

---

Configuration

📅 Schedule: Branch creation - "every weekday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.