chore: node 20 as default runtime #6223

Job	Run time
flavor	4s
docker-push	34s
bake	15s
global-exps	7s
images	4s
json	8s
labels	4s
multi-images	4s
output-env	10s
sep-tags ( )	7s
sep-tags (,)	3s
tag-match (\d.\d.\d, 0)	7s
tag-match (\d.\d, 0)	7s
tag-match (v(.*), 1)	4s
tag-schedule	9s
tag-schedule (cron-{{date 'YYYYMMDD'}})	6s
tag-schedule ({{date 'YYYYMMDD-HHmmss'}})	6s
tag-schedule (schedule)	7s
tag-semver (auto)	4s
tag-semver (true)	7s
tag-semver (false)	13s
	2m 50s

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