fix(helm): update chart grafana to 6.58.7

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
grafana (source)	patch	6.58.6 -> 6.58.7

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Release Notes

grafana/helm-charts (grafana)

### [`v6.58.7`](https://togithub.com/grafana/helm-charts/releases/tag/grafana-6.58.7) The leading tool for querying and visualizing time series and metrics. #### What's Changed - \[loki] Update README by [@​JStickler](https://togithub.com/JStickler) in [https://github.com/grafana/helm-charts/pull/2567](https://togithub.com/grafana/helm-charts/pull/2567) - \[grafana] Update Grafana version to v10.0.3 by [@​terop](https://togithub.com/terop) in [https://github.com/grafana/helm-charts/pull/2570](https://togithub.com/grafana/helm-charts/pull/2570) #### New Contributors - [@​terop](https://togithub.com/terop) made their first contribution in [https://github.com/grafana/helm-charts/pull/2570](https://togithub.com/grafana/helm-charts/pull/2570) **Full Changelog**: https://github.com/grafana/helm-charts/compare/loki-stack-2.9.11...grafana-6.58.7

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