deps: Update dependency zx to v8.1.5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
zx	8.1.4 -> 8.1.5

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Release Notes

google/zx (zx)

### [`v8.1.5`](https://togithub.com/google/zx/releases/tag/8.1.5) [Compare Source](https://togithub.com/google/zx/compare/8.1.4...8.1.5) We've rolled out a new release! ##### Fixes - Added the minimist typings to the dts bundle. [#​872](https://togithub.com/google/zx/pull/872) brings the fix. - Re-enabled the YAML extra API. [#​870](https://togithub.com/google/zx/issues/870) [#​879](https://togithub.com/google/zx/pull/879) ##### Chores - Clarified `cd()`, `within()` and `syncProcessCwd()` interactions. [#​878](https://togithub.com/google/zx/pull/878) - Included mention of the `cwd` option in the documentation. [#​868](https://togithub.com/google/zx/pull/868) - Test enhancements. [#​877](https://togithub.com/google/zx/pull/877) [#​880](https://togithub.com/google/zx/pull/880)

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