[enricobattocchi]

Context

Refs Yoast/wordpress-seo#23529.

Previous iteration: #438.

Summary

This PR can be summarized in the following changelog entry:

• Sets the minimum supported WordPress version to 6.9.

Relevant technical choices:

• Bumps the WordPress versions used in the CI test matrix accordingly.

Test instructions

Test instructions for the acceptance test before the PR gets merged

This PR can be acceptance tested by following these steps:

• Verify that duplicate-post.php and readme.txt state Requires at least: 6.9.
• On a site running WordPress 6.9 or newer, verify that the plugin activates and works as before.

Relevant test scenarios

• Changes should be tested with the browser console open
• Changes should be tested on different posts/pages/taxonomies/custom post types/custom taxonomies
• Changes should be tested on different editors (Default Block/Gutenberg/Classic/Elementor/other)
• Changes should be tested on different browsers
• Changes should be tested on multisite

Test instructions for QA when the code is in the RC

• QA should use the same steps as above.

QA can test this PR by following these steps:

Impact check

This PR affects the following parts of the plugin, which may require extra testing:

• The plugin can no longer be installed on WordPress versions below 6.9.

UI changes

• This PR changes the UI in the plugin. I have added the 'UI change' label to this PR.

Documentation

• I have written documentation for this change. For example, comments in the Relevant technical choices, comments in the code, documentation on Confluence / shared Google Drive / Yoast developer portal, or other.

Quality assurance

• I have tested this code to the best of my abilities
• I have added unittests to verify the code works as intended

Innovation

• No innovation project is applicable for this PR.
• This PR falls under an innovation project. I have attached the innovation label and noted the work hours.

Fixes #

[coveralls-official]

Coverage Report for CI Build 30550578294

Coverage remained the same at 62.83%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	2728
Covered Lines:	1714
Line Coverage:	62.83%
Coverage Strength:	9.29 hits per line

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💛 - Coveralls