fix(helm): update chart k8s-monitoring to 1.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
k8s-monitoring	patch	1.6.7 -> 1.6.8

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Release Notes

grafana/helm-charts (k8s-monitoring)

### [`v1.6.8`](https://redirect.github.com/grafana/helm-charts/releases/tag/tempo-distributed-1.6.8) [Compare Source](https://redirect.github.com/grafana/helm-charts/compare/k8s-monitoring-1.6.7...k8s-monitoring-1.6.8) Grafana Tempo in MicroService mode #### What's Changed - \[tempo-distributed] Propagate settings for tempo-query to container by [@​toscott](https://redirect.github.com/toscott) in [https://github.com/grafana/helm-charts/pull/2678](https://redirect.github.com/grafana/helm-charts/pull/2678) #### New Contributors - [@​toscott](https://redirect.github.com/toscott) made their first contribution in [https://github.com/grafana/helm-charts/pull/2678](https://redirect.github.com/grafana/helm-charts/pull/2678) **Full Changelog**: https://github.com/grafana/helm-charts/compare/mimir-distributed-5.2.0-weekly.258...tempo-distributed-1.6.8

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