Update dependency zx to v8.1.9

[renovate]

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

Compare Source

Today's release is a minor update that includes:

Enhancements

• We have replaced ProcessOutput fields with lazy getters to reduce mem consumption #​903, #​908
• Reduced ReDos risks for codeblock patterns #​906
• Keep argv reference on update #​916
• Strengthened Shell interface to properly handle sync mode #​915:

expectType<ProcessPromise>($`cmd`)
expectType<ProcessPromise>($({ sync: false })`cmd`)
expectType<ProcessOutput>($({ sync: true })`cmd`)
expectType<ProcessOutput>($.sync`cmd`)

Fixes

• Correctly fill stdall for $.sync calls: #​911, #​912

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