Bump SDKMAN, Java 8 and 11

What does this MR do?

Bump SDKMAN to 5.8.0+475, Java 8 to 8.0.252, and Java 11 to 11.0.7.

What are the relevant issue numbers?

N/A

Red Master since 2 weeks now: https://gitlab.com/gitlab-org/security-products/analyzers/spotbugs/pipelines/139908388 and https://gitlab.com/gitlab-org/security-products/analyzers/spotbugs/pipelines/142077803

Does this MR meet the acceptance criteria?

• Changelog entry added
• [-] Documentation created/updated for GitLab EE, if necessary
• [-] Documentation created/updated for this project, if necessary
• [-] Documentation reviewed by technical writer or follow-up review issue created
• [-] Tests added for this feature/bug
• [-] Job definition updated, if necessary
  • Auto-DevOps template (also in CE)
  • Job definition example
  • CI Templates (to be removed)
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer