Update dependency zx to v8.1.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
zx	8.1.5 -> 8.1.6

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Release Notes

google/zx (zx)

v8.1.6

Compare Source

Improvements & Fixes

• The $.preferLocal option now also accepts a directory #​886, #​887.

$.preferLocal = true             // injects node_modules/.bin to the $PATH
$.preferLocal = '/foo/bar'       // attaches /foo/bar to the $PATH
$.preferLocal = ['/bar', '/baz'] // now the $PATH includes both /bar and /baz

Why not just $.env['PATH'] = 'extra:' + '$.env['PATH']?
Well, the API internally does the same, but also handles the win paths peculiarities.

• Provided $.killSignal option for the symmetry with the $.timeoutSignal. You can override the default termination flow #​885:

$.killSignal = 'SIGKILL'

const p = $({nothrow: true})`sleep 10000`
setTimeout(p.kill, 100)
  
(await p).signal // SIGKILL

• $ opt presets became chainable #​883:

const $$ = $({ nothrow: true })
assert.equal((await $$`exit 1`).exitCode, 1)

const $$$ = $$({ sync: true }) // Both {nothrow: true, sync: true} are applied
assert.equal($$$`exit 2`.exitCode, 2)

• Enhanced the internal Duration parser #​884:

const p = $({timeout: '1mss'})`sleep 999` // raises an error now

• Abortion signal listeners are now removed after the process completes #​881, #​889, zurk#12, zurk#13.
• Extended integration tests matrix, added nodejs-nightly builds and TS dev snapshots #​888

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