Update Helm release grafana to v6.26.2

This MR contains the following updates:

Package	Update	Change
grafana (source)	patch	6.26.1 -> 6.26.2

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Release Notes

grafana/helm-charts

v6.26.2

Compare Source

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

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This MR has been generated by Renovate Bot.

added renovate label

assigned to @mareo, @charles, and @nico

mentioned in issue #26

merged