fix(deps): update dependency google-gax to ^4.3.8

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-gax (source)	^4.3.7 -> ^4.3.8

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Release Notes

googleapis/gax-nodejs (google-gax)

### [`v4.3.8`](https://togithub.com/googleapis/gax-nodejs/blob/HEAD/gax/CHANGELOG.md#438-2024-07-08) [Compare Source](https://togithub.com/googleapis/gax-nodejs/compare/google-gax-v4.3.7...google-gax-v4.3.8) ##### Bug Fixes - **deps:** remove rimraf in favor of native node rm function ([#​1626](https://togithub.com/googleapis/gax-nodejs/issues/1626)) ([dd87646](https://togithub.com/googleapis/gax-nodejs/commit/dd87646618d5026549920e224df7f85cbb5ff6a8))

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