chore(deps): update helm release promtail to v6.16.6

This MR contains the following updates:

Package	Update	Change	OpenSSF
promtail (source)	patch	6.16.5 -> 6.16.6

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Release Notes

grafana/helm-charts (promtail)

v6.16.6

Compare Source

Promtail is an agent which ships the contents of local logs to a Loki instance

What's Changed

• [promtail] allow to inject templates by @​Wielewout in https://github.com/grafana/helm-charts/pull/3248

New Contributors

• @​Wielewout made their first contribution in https://github.com/grafana/helm-charts/pull/3248

Full Changelog: https://github.com/grafana/helm-charts/compare/grafana-agent-operator-0.4.2...promtail-6.16.6

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