Required version to luet is pinned

[mudler]

https://github.com/rancher-sandbox/cOS-toolkit/blob/e522e00c668394e391fc1858b4e190488af33393/packages/toolchain/collection.yaml#L34

The anchor here takes the whole luet block, version included. This doesn't allow any other version except the latest, which is not the case for those components (it doesn't allow then to easily pinpoint to an old luet version, as I was trying in #943 )

The anchor can take additional fields to override, so maybe we can just depend on luet >0.20.0.

Workaround is to force installation of the package:
luet --force --relax --nodeps <package>