Update Helm release loki to v2.9.0

This MR contains the following updates:

Package	Update	Change
loki (source)	minor	2.8.5 -> 2.9.0

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Release Notes

grafana/helm-charts

v2.9.0

Compare Source

Loki: like Prometheus, but for logs.

v2.8.6

Compare Source

Loki: like Prometheus, but for logs.

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Configuration

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