fix: update default worker container port for health checks

[Steffen911]

Fixes langfuse/langfuse#5878 (comment)

---

Important

Update default worker container port to 3030 and bump version to 1.0.0-rc.8.

• Deployment Configuration:
  • Update default containerPort for worker in deployment.yaml from 3000 to 3030.
• Versioning:
  • Bump version in Chart.yaml and README.md from 1.0.0-rc.7 to 1.0.0-rc.8.

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