[Deprecation] JDK 8/9/10 Support State

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Summary

CLI utility classifies JDK 8/9/10 as deprecated and warns users to upgrade.

Evidence

• src/puppetlabs/puppetdb/cli/util.clj:19 and :20 classify Java 8/9/10 as :deprecated.
• src/puppetlabs/puppetdb/cli/util.clj:30 warning text: upgrade to JDK 11/17/21.
• test/puppetlabs/puppetdb/cli/util_test.clj:16 verifies deprecated statuses.

Proposed OpenVoxDB 9 Change

• Finalize Java support policy for OpenVoxDB 9.
• If policy permits, move 8/9/10 from deprecated to unsupported.

Compatibility / Risk

• Potentially high risk depending on installed JVM versions in user environments.
• Requires release communication and packaging alignment.

Implementation Notes

• Align startup/CLI behavior, docs, and CI matrix with support policy.
• Update warning/error messaging to remove ambiguity.

Acceptance Criteria

• Java support matrix is explicit for OpenVoxDB 9.
• Runtime behavior and tests align with policy.

Suggested Tests

• jdk-support-status unit tests for supported/unsupported versions.
• CLI behavior tests for warn vs error paths.

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Deprecated in 6a96dd0.