Update dependency slash to v5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
slash	^4.0.0 -> ^5.0.0

---

Release Notes

sindresorhus/slash

### [`v5.0.0`](https://togithub.com/sindresorhus/slash/releases/tag/v5.0.0) [Compare Source](https://togithub.com/sindresorhus/slash/compare/v4.0.0...v5.0.0) ##### Breaking - Require Node.js 14 [`5c5d1d6`](https://togithub.com/sindresorhus/slash/commit/5c5d1d6) ##### Improvements - Remove non-ASCII limitation ([#​20](https://togithub.com/sindresorhus/slash/issues/20)) [`b83ed2a`](https://togithub.com/sindresorhus/slash/commit/b83ed2a)

---

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, click this checkbox.

---

This PR has been generated by Mend Renovate. View repository job log here.