README.md: Update "Tested up to" to 6.9

[acicovic]

Description

This PR updates the "Tested up to" field of README.md to 6.9.

Motivation and Context

Keep our README.md updated with the latest information.

How Has This Been Tested?

• Current tests pass. Our integration tests are running against WP latest/trunk and our E2E tests against latest stable through wp-env.
• No code changes.

Summary by CodeRabbit

• Documentation
  • Updated compatibility information to indicate testing support for version 6.9.

[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: 8947f904-be97-48c2-a374-67fb3a9c236a

📥 Commits

Reviewing files that changed from the base of the PR and between 59af9f0 and 7627c82.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Updated the "Tested up to" field in README.md from WordPress version 6.8 to 6.9. This is a metadata change with no functional or content modifications.

Changes

Cohort / File(s)	Summary
Documentation README.md	Updated "Tested up to" version field from 6.8 to 6.9.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• README.md: Update "Tested up to" to 6.7 #2924 — Previous "Tested up to" field update to a newer WordPress version
• README.md: Update "Tested up to" to 6.8 #3274 — Earlier "Tested up to" field modification to version 6.8

Suggested labels

Maintenance

Suggested reviewers

• vaurdan
• alecgeatches

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and clearly summarizes the main change: updating the 'Tested up to' field in README.md to version 6.9.
Description check	✅ Passed	The PR description includes all required template sections (Description, Motivation and Context, How Has This Been Tested) with appropriate details and reasoning.
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
• Commit unit tests in branch update/readme.md-tested-wp-version-to-6.9

📝 Coding Plan

• Generate coding plan for human review comments

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