chore(deps): update yarn to v4.9.4 (#561)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [yarn](https://redirect.github.com/yarnpkg/berry)
([source](https://redirect.github.com/yarnpkg/berry/tree/HEAD/packages/yarnpkg-cli))
| [`4.9.3` ->
`4.9.4`](https://renovatebot.com/diffs/npm/yarn/4.9.3/4.9.4) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/@yarnpkg%2fcli/4.9.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@yarnpkg%2fcli/4.9.3/4.9.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>yarnpkg/berry (yarn)</summary>

###
[`v4.9.4`](https://redirect.github.com/yarnpkg/berry/compare/ce83c49a943eb9e121731e938222a9442062f609...1a2e7ac78295e684bce8e0c5215f82fd377008d4)

[Compare
Source](https://redirect.github.com/yarnpkg/berry/compare/ce83c49a943eb9e121731e938222a9442062f609...1a2e7ac78295e684bce8e0c5215f82fd377008d4)

</details>

---

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