Upgrade fluentd-elasticsearch to v13.7.0

[lucianvlad]

What Chart should be upgraded?

upstream/fluentd chart

Why should this Chart be upgraded?

• [ ] We need to perform a security upgrade.
• [ ] We need it for a new feature: which feature (link to blocked issue).
• [x] We need to keep up to prevent future issues.
• [ ] Other: Write the reason here

Acceptance criteria

• I checked the migration of the new Chart:
  • [ ] I upgraded a Chart and determined that no migration steps are needed.
  • [ ] I upgraded a Chart and added migration steps.
• [ ] I tested the functionality provided by the new Chart (e.g., Auth flow, Grafana dashboards, etc.)