auto-docs: Update property docs for tag v25.3.9

[vbotbuildovich]

This PR auto-generates updated Redpanda property documentation for v25.3.9.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7c7507c and ea2baab.

📒 Files selected for processing (4)

• antora.yml
• docs-data/redpanda-property-changes-v25.3.8-to-v25.3.9.json
• modules/reference/attachments/redpanda-properties-v25.3.9.json
• modules/reference/partials/properties/cluster-properties.adoc

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📝 Walkthrough

Walkthrough

This pull request updates version metadata from v25.3.8 to v25.3.9 across documentation configuration and data files. The changes include updating the Antora configuration fallback version, removing a property change tracking entry from the version comparison manifest, adding a version field to property definitions, and appending a version introduction note to the cluster properties documentation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• auto-docs: Update property docs for tag v25.3.8 #1587: Removes the log_compaction_max_priority_wait_ms property entry from docs when updating to v25.3.9, directly complementing the property change tracking updates in this PR

Suggested reviewers

• paulohtb6

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is incomplete; it lacks required template sections including JIRA ticket reference, page previews, review deadline, and check items specified in the repository template.	Add the JIRA ticket reference, review deadline, page preview links, and check the appropriate box (likely 'Auto-docs update') to match the repository description template.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: updating property documentation for the v25.3.9 release tag, which aligns with the primary purpose of this auto-generated PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch update-property-docs-v25.3.9

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