chore(main): release 1.77.0 #15982

Job	Run time
owlbot-py	56s
generate-readme	4m 44s
root-pom	1m 30s
gitignore_correctness	48s
gapic-bom	1m 31s
group_id_check_for_maps_libraries	6m 33s
owlbot-yaml	48s
package_name_check	48s
	17m 38s

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