[kube-prometheus-stack] Bump grafana deps to 8.5.*

[karthikpenugonda22]

What this PR does / why we need it

PR will bump the Grafana deps to 8.5.* version, which is currently the latest version available in the Grafana Helm Chart

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer

This version fixes an interesting bug that lies in the 8.4.* version, where the grafana adds Kind=server as the filter to the traceql query when a trace is selected refer: https://github.com/grafana/grafana/issues/88635

Checklist

• [x] DCO signed
• [x] Chart Version bumped
• [x] Title of the PR starts with chart name (e.g. [prometheus-couchdb-exporter])