Drop support for WP 6.3

[enricobattocchi]

Relevant confluence document

Previous issue dropping 6.2

Tasks

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1. Set the minimum supported WordPress version to 6.4. #21343
   changelog: other +1
2. https://github.com/Yoast/wordpress-seo-premium/pull/4290
3. https://github.com/Yoast/wpseo-woocommerce/pull/1005
4. https://github.com/Yoast/wpseo-news/pull/873
5. https://github.com/Yoast/wordpress-seo-local/pull/2530
6. https://github.com/Yoast/wpseo-video/pull/1099
7. Update the testing matrix in Free
8. Update the testing matrix in Premium
9. Sets the minimum supported WordPress version to 6.4. yoast-test-helper#229
   changelog: other +1
10. Test Helper SVN
11. Sets the minimum supported WordPress version to 6.4. duplicate-post#370
    changelog: other +1
12. Duplicate Post SVN aiming to release it in the summer
13. Sets the minimum supported WordPress version to 6.4. yoast-acf-analysis#377
    changelog: other +1
14. ACF Analysis SVN
15. Sets the minimum supported WordPress version to 6.4. custom-field-finder#4
    changelog:other +1
16. Custom field finder SVN
17. Sets the minimum supported WordPress version to 6.4. yoastcs#380
    Type: chores/QA +1