chore(deps): update helm release loki to v6.12.0

This MR contains the following updates:

Package	Update	Change	OpenSSF
loki (source)	minor	6.11.0 -> 6.12.0

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Release Notes

grafana/helm-charts (loki)

v6.12.0

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

Source commit: https://github.com/grafana/loki/commit/08e61ca4db086b573ef636a156bfc624132515be

Tag on source: https://github.com/grafana/loki/releases/tag/helm-loki-6.12.0

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