chore: node 20 as default runtime #6230

Job	Run time
docker-push	29s
bake	18s
flavor	4s
global-exps	3s
images	7s
json	11s
labels	6s
multi-images	4s
output-env	16s
sep-tags ( )	9s
sep-tags (,)	7s
tag-match (\d.\d.\d, 0)	7s
tag-match (\d.\d, 0)	5s
tag-match (v(.*), 1)	7s
tag-schedule	4s
tag-schedule (cron-{{date 'YYYYMMDD'}})	7s
tag-schedule ({{date 'YYYYMMDD-HHmmss'}})	5s
tag-schedule (schedule)	4s
tag-semver (auto)	5s
tag-semver (true)	4s
tag-semver (false)	4s
	2m 46s

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