deps: Update dependency zx to v8.1.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
zx (source)	8.1.8 -> 8.1.9

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Release Notes

google/zx (zx)

### [`v8.1.9`](https://redirect.github.com/google/zx/releases/tag/8.1.9) [Compare Source](https://redirect.github.com/google/zx/compare/8.1.8...8.1.9) Today's release is a minor update that includes: #### Enhancements - We have replaced `ProcessOutput` fields with lazy getters to reduce mem consumption [#​903](https://redirect.github.com/google/zx/pull/903), [#​908](https://redirect.github.com/google/zx/pull/908) - Reduced ReDos risks for codeblock patterns [#​906](https://redirect.github.com/google/zx/pull/906) - Keep `argv` reference on update [#​916](https://redirect.github.com/google/zx/pull/916) - Strengthened `Shell` interface to properly handle `sync` mode [#​915](https://redirect.github.com/google/zx/pull/915): ```ts expectType($`cmd`) expectType($({ sync: false })`cmd`) expectType($({ sync: true })`cmd`) expectType($.sync`cmd`) ``` #### Fixes - Correctly fill `stdall` for `$.sync` calls: [#​911](https://redirect.github.com/google/zx/pull/911), [#​912](https://redirect.github.com/google/zx/pull/912)

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