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I've chased this up, and it's now updated. After a

helm repo update

you should see new versions

$ helm show chart rancher-charts/rancher-monitoring     --version 103.0.0+up45.31.1 |     grep '<http://catalog.cattle.io/kube-version\%7Ccatalog.cattle.io/rancher-version|catalog.cattle.io/kube-version\|catalog.cattle.io/rancher-version>'
  <http://catalog.cattle.io/kube-version|catalog.cattle.io/kube-version>: '>= 1.16.0-0 < 1.28.0-0'
  catalog.cattle.io/rancher-version: '>= 2.8.0-0 < 2.9.0-0'

Thank you so much, I greatly appreciate this! 🙂