feat: Update Java8, Java11, and default toolchain

What does this MR do?

Updates default toolchain

• Update Java8 to adoptopenjdk-8.0.282+8 (!89 (merged))
• Update Java11 to adoptopenjdk-11.0.10+9 (!89 (merged))
• Update gradle to 6.8.1 (!89 (merged))
  • This version of Gradle removes TLS protocols v1.0 and v1.1 from the default list of allowed protocols
• Update grails to 4.0.6 (!89 (merged))
• Update sbt to 1.4.6 (!89 (merged))

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/security-products/release/-/issues/106

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