chore(deps): update dependency com.google.api:gapic-generator-java to v2.60.2 #14599

Job	Run time
package_name_check	40s
owlbot-py	48s
root-pom	1m 25s
gapic-bom	1m 18s
group_id_check_for_maps_libraries	5m 55s
generate-readme	50s
owlbot-yaml	41s
gitignore_correctness	41s
	12m 18s

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