It looks like 2.8.0 didn't get published to your HTTP helm repo?
❯ helm repo add dacruz https://dacruz21.github.io/helm-charts
"dacruz" already exists with the same configuration, skipping
❯ helm repo update
Hang tight while we grab the latest from your chart repositories...
...Successfully got an update from the "dacruz" chart repository
Update Complete. ⎈Happy Helming!⎈
❯ helm search repo matrix
NAME CHART VERSION APP VERSION DESCRIPTION
dacruz/matrix 2.7.0 1.19.3 A Helm chart to deploy a Matrix homeserver stac...
Hello!
I'm excited to try your chart!
It looks like 2.8.0 didn't get published to your HTTP helm repo?