chore(helm-chart): update chart loki to 5.27.0

This PR contains the following updates:

Package	Update	Change
loki (source)	minor	`5.26.0` -> `5.27.0`

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Release Notes

grafana/helm-charts (loki)

### [`v5.27.0`](https://togithub.com/grafana/helm-charts/releases/tag/helm-loki-5.27.0) Helm chart for Grafana Loki in simple, scalable mode Source commit: https://github.com/grafana/loki/commit/dbf7dd4bac112a538a59907a8c6092504e7f4a91 Tag on source: https://github.com/grafana/loki/releases/tag/helm-loki-5.27.0

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fisherbln / virt-ops