feat(charts): update helm release loki to v6.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
loki (source)	minor	6.6.6 -> 6.7.0

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Release Notes

grafana/helm-charts (loki)

### [`v6.7.0`](https://togithub.com/grafana/helm-charts/releases/tag/promtail-6.7.0) Promtail is an agent which ships the contents of local logs to a Loki instance

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[github-actions[bot]]

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