chore(main): release 1.77.0 #15961

Job	Run time
owlbot-py	45s
gapic-bom	1m 17s
owlbot-yaml	38s
root-pom	1m 16s
group_id_check_for_maps_libraries	6m 31s
generate-readme	42s
gitignore_correctness	39s
package_name_check	38s
	12m 26s

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