chore: shared-deps third party's parent is generator-pom-parent #6204

Job	Run time
build (11)	12m 41s
build (17)	12m 40s
build(21) except self-service clients	11m 11s
build(8) except for gapic-generator-java	3m 56s
build(8) for gapic-generator-java	9m 23s
compatibility	1m 30s
lint	28s
showcase (11)	4m 2s
showcase (17)	4m 4s
dependency_analyzer_unit_test	16s
gapic-generator-java-bom	1m 46s
showcase-clirr	2m 49s
showcase-native	8m 12s
unmanaged_dependency_check	5m 33s
	1h 18m 31s

Provide feedback