deps: update junit5 monorepo to v5.11.1 #8319

Job	Run time
build (11)	15m 45s
build (17)	14m 46s
build(21) except self-service clients	14m 0s
build(8) except for gapic-generator-java	4m 58s
build(8) for gapic-generator-java	11m 37s
lint	27s
compatibility	1m 39s
showcase (11)	4m 40s
showcase (17)	4m 9s
showcase (21)	4m 9s
dependency_analyzer_unit_test	30s
gapic-generator-java-bom	2m 30s
showcase-clirr	3m 1s
showcase-native	8m 36s
unmanaged_dependency_check	8m 23s
	1h 39m 10s

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