chore(main): release 1.77.0-SNAPSHOT #15828

Job	Run time
gitignore_correctness	38s
gapic-bom	1m 15s
generate-readme	45s
owlbot-yaml	37s
root-pom	1m 19s
owlbot-py	47s
group_id_check_for_maps_libraries	6m 16s
package_name_check	37s
	12m 14s

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