release: v0.3.4

[justlevine]

What

version bump

Why

How

Testing Instructions

Additional Info

Checklist:

• My code is tested to the best of my abilities.
• My code follows the WordPress Coding Standards.
• My code has proper inline documentation.
• I have added unit tests to verify the code works as intended.
• The changes in this PR have been noted in CHANGELOG.md

[Copilot]

Pull Request Overview

This PR bumps the plugin version from 0.3.3 to 0.3.4 while updating version strings, badges, and related metadata.

• Updated version numbers and tested WordPress versions in PHP header comment, readme.txt, and phpstan/constants.php
• Updated badges in README.md and added a new changelog section in CHANGELOG.md

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
wp-graphql-rank-math.php	Version and tested up to values updated in the file header
readme.txt	Version bump and updated stable tag with new WordPress version info
phpstan/constants.php	Constant version updated to reflect the new version
README.md	Badge version updated to show the new release version
CHANGELOG.md	Added a new section describing the 0.3.4 release changes