deps: update dependency black to v24.8.0 #8320

Job	Run time
build (11)	15m 2s
build(8) except for gapic-generator-java	4m 29s
build(21) except self-service clients	13m 40s
build(8) for gapic-generator-java	11m 20s
build (17)	15m 9s
lint	21s
dependency_analyzer_unit_test	23s
compatibility	1m 31s
gapic-generator-java-bom	1m 49s
showcase (11)	4m 24s
showcase (17)	4m 17s
showcase-clirr	3m 7s
showcase (21)	4m 38s
showcase-native	8m 40s
unmanaged_dependency_check	3m 48s
	1h 32m 38s

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