chore(deps): update helm release grafana to v13

[renovate]

This PR contains the following updates:

Package	Update	Change
grafana (source)	major	12.11.2 → 13.0.0

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Release Notes

grafana-community/helm-charts (grafana)

v13.0.0

Compare Source

The leading tool for querying and visualizing time series and metrics.

What's Changed

• [grafana] Set readOnlyRootFilesystem=true and use distroless image tag by @​jkroepke in #​756

Full Changelog: grafana-community/helm-charts@synthetic-monitoring-agent-1.18.0...grafana-13.0.0

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