Fix incorrect JDK version in CONTRIBUTING.md

[Shazaanashraff]

README.md states the product supports JDK 21, but CONTRIBUTING.md instructed contributors to install JDK 11. Aligning the build instructions with the supported JDK to prevent contributor confusion.

[CLAassistant]

All committers have signed the CLA.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: f3c3c182-6302-4ba7-8972-a41092356d29

📥 Commits

Reviewing files that changed from the base of the PR and between b1d6bf2 and 515c99a.

📒 Files selected for processing (1)

• CONTRIBUTING.md

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📝 Walkthrough

Walkthrough

CONTRIBUTING.md updates the documented Java build requirement from Java SE Development Kit 11 to Java SE Development Kit 21 in the build-from-source prerequisites section.

Changes

Build Prerequisites Documentation

Layer / File(s)	Summary
JDK version update in build prerequisites CONTRIBUTING.md	Build documentation updates the required Java SE Development Kit from version 11 to version 21 in the build-from-source section.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: updating the JDK version in CONTRIBUTING.md from 11 to 21.
Description check	✅ Passed	The description clearly explains the rationale for the change, referencing the discrepancy between README.md (JDK 21) and CONTRIBUTING.md (JDK 11), directly relating to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

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• Create PR with unit tests

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