chore(deps): update helm release promtail to v6.6.2

This MR contains the following updates:

Package	Update	Change
promtail (source)	patch	6.6.1 -> 6.6.2

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Release Notes

grafana/helm-charts

v6.6.2

Compare Source

Promtail is an agent which ships the contents of local logs to a Loki instance

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Configuration

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merged

mentioned in merge request !867 (merged)

mentioned in merge request !888 (merged)