Update dependency irregular-plurals to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
irregular-plurals	^3.2.0 -> ^4.0.0

---

Release Notes

sindresorhus/irregular-plurals (irregular-plurals)

### [`v4.0.0`](https://redirect.github.com/sindresorhus/irregular-plurals/releases/tag/v4.0.0) [Compare Source](https://redirect.github.com/sindresorhus/irregular-plurals/compare/v3.5.0...v4.0.0) ##### Breaking - Require Node.js 18 [`db10c17`](https://redirect.github.com/sindresorhus/irregular-plurals/commit/db10c17) - This package is now pure ESM. **Please [read this](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).**

---

Configuration

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

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, 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.