chore(ci): fix permission for update_librarian_googleapis workflow #19398

Job	Run time
owlbot-py	1m 18s
generate-readme	1m 22s
gapic-bom	1m 50s
group_id_check_for_maps_libraries	9m 30s
gitignore_correctness	1m 8s
package_name_check	1m 16s
root-pom	1m 50s
owlbot-yaml	1m 9s
	19m 23s

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