fix(helm): update chart grafana to 8.4.8

[dcplaya-s-app[bot]]

This PR contains the following updates:

Package	Update	Change
grafana (source)	patch	8.4.7 -> 8.4.8

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Release Notes

grafana/helm-charts (grafana)

### [`v8.4.8`](https://togithub.com/grafana/helm-charts/releases/tag/grafana-8.4.8) [Compare Source](https://togithub.com/grafana/helm-charts/compare/grafana-8.4.7...grafana-8.4.8) The leading tool for querying and visualizing time series and metrics. #### What's Changed - \[grafana] fixed url link for persistent volume claim in values.yaml by [@​usmangt](https://togithub.com/usmangt) in [https://github.com/grafana/helm-charts/pull/2881](https://togithub.com/grafana/helm-charts/pull/2881) #### New Contributors - [@​usmangt](https://togithub.com/usmangt) made their first contribution in [https://github.com/grafana/helm-charts/pull/2881](https://togithub.com/grafana/helm-charts/pull/2881) **Full Changelog**: https://github.com/grafana/helm-charts/compare/alloy-0.6.1...grafana-8.4.8

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