chore(deps): update helm release promtail to v6.16.4

This MR contains the following updates:

Package	Update	Change	OpenSSF
promtail (source)	patch	6.16.3 -> 6.16.4

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Release Notes

grafana/helm-charts (promtail)

v6.16.4

Compare Source

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

What's Changed

• [promtail] service-extra: custom labels not working by @​camrossi in https://github.com/grafana/helm-charts/pull/3220

New Contributors

• @​camrossi made their first contribution in https://github.com/grafana/helm-charts/pull/3220

Full Changelog: https://github.com/grafana/helm-charts/compare/oncall-1.8.4...promtail-6.16.4

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