Update Helm release promtail to v3.8.2

This MR contains the following updates:

Package	Update	Change
promtail (source)	patch	3.8.1 -> 3.8.2

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Release Notes

grafana/helm-charts

v3.8.2

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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