chore(main): release 1.420.1 (#4665) #12129

Job	Run time
build	10m 8s
build_ee_312	0s
build_ee	14m 17s
build_full	0s
build_slim	0s
build_ee_nsjail	1m 42s
build_ee_full	0s
build_ee_cuda	0s
attach_amd64_binary_to_release	0s
run_integration_test	21s
build_ee_slim	0s
tag_latest	0s
tag_latest_ee	0s
verify_ee_image_vulnerabilities	0s
build_ee_reports_privately	2m 38s
publish_ecr_s3	1m 38s
	30m 44s

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