fix(promtail): update flux helm-release to v6.15.2

[tyriis-automation]

This PR contains the following updates:

Package	Update	Change
promtail (source)	patch	6.15.1 -> 6.15.2

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Release Notes

grafana/helm-charts (promtail)

v6.15.2

Compare Source

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

What's Changed

• [promtail] bump promtail version to 2.9.1 by @​emilkor1 in https://github.com/grafana/helm-charts/pull/2658

New Contributors

• @​emilkor1 made their first contribution in https://github.com/grafana/helm-charts/pull/2658

Full Changelog: grafana/helm-charts@loki-distributed-0.74.3...promtail-6.15.2

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[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

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✅ REPOSITORY	gitleaks	yes		no	2.59s
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[github-actions]

Helm Release: kubernetes/apps/observability/promtail/app/helm-release.yaml

spec.template.spec.containers.promtail.image  (DaemonSet/default/promtail)
  ± value change
    - docker.io/grafana/promtail:2.8.4
    + docker.io/grafana/promtail:2.9.1