chore(helm-chart): update chart grafana to 6.60.2

This PR contains the following updates:

Package	Update	Change
grafana (source)	patch	`6.60.1` -> `6.60.2`

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Release Notes

grafana/helm-charts (grafana)

### [`v6.60.2`](https://togithub.com/grafana/helm-charts/releases/tag/grafana-6.60.2) [Compare Source](https://togithub.com/grafana/helm-charts/compare/grafana-6.60.1...grafana-6.60.2) The leading tool for querying and visualizing time series and metrics. #### What's Changed - \[grafana] fix: allow using existing clusterrole by [@gadisn](https://togithub.com/gadisn) in [https://github.com/grafana/helm-charts/pull/2691](https://togithub.com/grafana/helm-charts/pull/2691) #### New Contributors - [@gadisn](https://togithub.com/gadisn) made their first contribution in [https://github.com/grafana/helm-charts/pull/2691](https://togithub.com/grafana/helm-charts/pull/2691) **Full Changelog**: https://github.com/grafana/helm-charts/compare/lgtm-distributed-1.0.0...grafana-6.60.2

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fisherbln / virt-ops