chore: node 20 as default runtime #1228

Job	Run time
docker-driver	14s
error	8s
error-buildx	24s
export-docker	12s
example	15s
git-context	15s
git-context-secret	30s
minimal	16s
path-context	38s
secret	10s
add-hosts	11s
attests-compat (latest, moby/buildkit:buildx-stable-1)	40s
attests-compat (latest, moby/buildkit:v0.10.6)	32s
attests-compat (v0.9.1, moby/buildkit:buildx-stable-1)	35s
cgroup-parent	27s
digest (docker, true, false)	20s
digest (docker, false, true)	23s
digest (docker, false, false)	48s
digest (docker-container, true, false)	15s
digest (docker-container, false, true)	12s
digest (docker-container, false, false)	12s
docker-config-malformed	10s
github-cache	18s
multi (multi)	31s
multi (multi-sudo)	34s
named-context-container	26s
named-context-docker	32s
named-context-pin	9s
network	15s
no-cache-filters	16s
provenance	16s
provenance (mode=max)	10s
provenance (builder-id=foo)	10s
provenance (false)	11s
provenance (true)	19s
proxy-buildkitd	29s
proxy-docker-config	23s
registry-cache	32s
sbom (image, type=image,name=localhost:5000/name/app:latest,push=true)	22s
sbom (binary, /tmp/buildx-build)	32s
shm-size	45s
standalone	25s
ulimit	15s
	15m 37s

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