fix: overwrite region default for eventUpload

[Steffen911]

Fixes #93

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Important

Change default S3 region for eventUpload to empty string and update version to 1.0.0-rc.9.

• Behavior:
  • Default S3 region for eventUpload changed from "auto" to "" in values.yaml.
• Documentation:
  • Updated README.md to reflect the new default S3 region for eventUpload.
• Versioning:
  • Bumped version from 1.0.0-rc.8 to 1.0.0-rc.9 in Chart.yaml and README.md.

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