chore(deps): update helm release promtail to v6.8.0

This MR contains the following updates:

Package	Update	Change
promtail (source)	minor	6.7.2 -> 6.8.0

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Release Notes

grafana/helm-charts

v6.8.0

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

v6.7.4

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

v6.7.3

Compare Source

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

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