Grafana k8s Monitoring

What's Changed

• fix: repo jetstack not found by @skl in https://github.com/grafana/k8s-monitoring-helm/pull/343
• feat: add support for customizing wal settings by @claudioscalzo in https://github.com/grafana/k8s-monitoring-helm/pull/337
• [dependency] Update Grafana Agent by @github-actions in https://github.com/grafana/k8s-monitoring-helm/pull/336

Full Changelog: https://github.com/grafana/k8s-monitoring-helm/compare/v0.8.3...v0.8.4