update to use WP beta so WPORG live preview utilizes WP 7.0

[jeffpaul]

What?

Closes #420.

Copilot summary

This pull request updates the preferred WordPress version in the .wordpress-org/blueprints/blueprint.json configuration file from latest to beta. This means that the blueprint will now target the beta version of WordPress for testing or deployment.

Why?

How?

Use of AI Tools

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

[github-actions]

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Co-authored-by: jeffpaul <jeffpaul@git.wordpress.org>
Co-authored-by: dkotter <dkotter@git.wordpress.org>
Co-authored-by: gohelkunjan <gohelkunjan@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.15%. Comparing base (aba36a2) to head (961d3fc).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #423   +/-   ##
==========================================
  Coverage      68.15%   68.15%           
  Complexity       808      808           
==========================================
  Files             53       53           
  Lines           3925     3925           
==========================================
  Hits            2675     2675           
  Misses          1250     1250           

Flag	Coverage Δ
unit	68.15% <ø> (ø)

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