chore: generate vertexai with protobuf 33.2 #15979

Job	Run time
root-pom	1m 27s
owlbot-py	1m 33s
package_name_check	48s
owlbot-yaml	50s
generate-readme	51s
gitignore_correctness	48s
group_id_check_for_maps_libraries	6m 26s
gapic-bom	1m 22s
	14m 5s

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