deps: update junit5 monorepo to v5.10.3 #7279

Job	Run time
build(21) except self-service clients	11m 32s
build (11)	12m 37s
build (17)	12m 48s
compatibility	1m 55s
build(8) except for gapic-generator-java	4m 13s
build(8) for gapic-generator-java	9m 38s
showcase (11)	4m 5s
showcase-native	8m 6s
showcase (17)	4m 7s
lint	38s
dependency_analyzer_unit_test	17s
gapic-generator-java-bom	1m 59s
showcase-clirr	3m 16s
unmanaged_dependency_check	5m 5s
	1h 20m 16s

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