fix(deps): update dependency google-gax to ^4.3.8 #3241

Job	Run time
build	1m 56s
lint	31s
lib-tests-esm (14.x, showcase)	2m 53s
lib-tests-esm (14.x, kms)	2m 39s
lib-tests-esm (14.x, translate)	2m 21s
lib-tests (14.x, showcase)	2m 4s
lib-tests-esm (14.x, monitoring)	3m 34s
lib-tests (14.x, kms)	1m 48s
lib-tests-esm (14.x, dlp)	2m 53s
lib-tests (14.x, translate)	1m 36s
lib-tests-esm (14.x, texttospeech)	2m 8s
lib-tests-esm (14.x, showcase-legacy)	2m 20s
lib-tests (14.x, monitoring)	2m 33s
lib-tests-esm (14.x, compute)	2m 15s
lib-tests (14.x, dlp)	2m 19s
lib-tests-esm (14.x, logging)	3m 11s
lib-tests (14.x, texttospeech)	1m 22s
lib-tests (14.x, showcase-legacy)	1m 21s
lib-tests (14.x, compute)	1m 32s
lib-tests (14.x, logging)	2m 19s
	43m 35s

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