fix: update helm release grafana to v7.0.3

This MR contains the following updates:

Package	Update	Change
grafana (source)	patch	7.0.2 -> 7.0.3

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Release Notes

grafana/helm-charts (grafana)

v7.0.3

Compare Source

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

What's Changed

• [grafana] revert 2748 and CVE fix by @​zanac1986 in https://github.com/grafana/helm-charts/pull/2757

Full Changelog: https://github.com/grafana/helm-charts/compare/k8s-monitoring-0.3.1...grafana-7.0.3

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