fix(deps): update dependency google-gax to ^4.3.8 (#1628) #3243

Job	Run time
build	5m 4s
lint	30s
lib-tests (14.x, showcase)	2m 2s
lib-tests-esm (14.x, showcase)	2m 57s
lib-tests (14.x, kms)	1m 44s
lib-tests (14.x, translate)	1m 31s
lib-tests-esm (14.x, kms)	2m 31s
lib-tests (14.x, monitoring)	2m 30s
lib-tests-esm (14.x, translate)	2m 21s
lib-tests (14.x, dlp)	2m 19s
lib-tests-esm (14.x, monitoring)	3m 25s
lib-tests (14.x, texttospeech)	1m 22s
lib-tests-esm (14.x, dlp)	2m 55s
lib-tests-esm (14.x, texttospeech)	2m 17s
lib-tests (14.x, showcase-legacy)	1m 26s
lib-tests (14.x, compute)	1m 27s
lib-tests-esm (14.x, showcase-legacy)	2m 23s
lib-tests (14.x, logging)	2m 13s
lib-tests-esm (14.x, compute)	2m 33s
lib-tests-esm (14.x, logging)	3m 4s
	46m 34s

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