[v3] mark buildx >= 0.20.0 as incompatible with docker/bake-action < v5 #2209

Job	Run time
bake (default)	14s
error-check	12s
error-buildx-latest	7s
bake (release)	13s
error-msg	6s
group	12s
provenance	13s
sbom (image, type=image,name=localhost:5000/name/app:latest,push=true)	15s
set	23s
provenance (mode=max)	8s
sbom (binary, /tmp/bake-build)	14s
source	1m 4s
provenance (builder-id=foo)	17s
standalone	8s
provenance (false)	18s
provenance (true)	11s
	4m 15s

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