chore(deps): update helm release loki to v6.6.4

This MR contains the following updates:

Package	Update	Change
loki (source)	patch	6.6.2 -> 6.6.4

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Release Notes

grafana/helm-charts (loki)

v6.6.4

Helm chart for Grafana Loki and Grafana Enterprise Logs supporting both simple, scalable and distributed modes.

Source commit: https://github.com/grafana/loki/commit/05176e445b90597379c268e799b0fb86b8629b9e

Tag on source: https://github.com/grafana/loki/releases/tag/helm-loki-6.6.4

v6.6.3

Helm chart for Grafana Loki and Grafana Enterprise Logs supporting both simple, scalable and distributed modes.

Source commit: https://github.com/grafana/loki/commit/9823f2030a294e6dc9c50d6f956a7691df5d53df

Tag on source: https://github.com/grafana/loki/releases/tag/helm-loki-6.6.3

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