Tests: Re-enable the test for recommended PHP version in readme.html.

This test verifies that the WordPress `readme.html` file recommends a PHP version that is actively supported.

As of WordPress 6.9, the recommended version of PHP is 8.3 or greater.

Follow-up to [52260], [54074], [60437], [meta14480].

Previously:
* [48178] / #50480 (PHP 7.3 → 7.4)
* [45058] / #46594 (PHP 7.2 → 7.3)
* [42358] / #42789 (PHP 7.0 → 7.2)
* [39428] / #39024 (PHP 5.6 → 7.0)
* [33937] / #33758 (PHP 5.4 → 5.6)

Related:
* #meta6612 Prepare for bumping the recommended PHP version to 8.0+
* #meta5279 Bump the recommended PHP version to 7.4
* #meta4009 Manage supported/recommended PHP versions in a central location

References:
* [https://make.wordpress.org/core/2025/07/07/proposal-remove-the-beta-support-label-from-php-8-3-for-wordpress-6-8/ Proposal: Remove the “beta support” label from PHP 8.3 for WordPress 6.8]
* [https://make.wordpress.org/core/2025/04/09/php-8-support-clarification/ PHP 8 support clarification]
* [https://make.wordpress.org/core/2023/06/20/proposal-criteria-for-removing-beta-support-from-each-php-8-version/ Proposal: Criteria for Removing “Beta Support” from Each PHP 8+ Version]
* [https://make.wordpress.org/core/handbook/references/php-compatibility-and-wordpress-versions/ PHP Compatibility and WordPress Versions]
* [https://www.php.net/supported-versions.php PHP Manual: Supported Versions]

See #63167.

git-svn-id: https://develop.svn.wordpress.org/trunk@60451 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

tests/phpunit/tests/readme.php

@@ -11,10 +11,6 @@ class Tests_Readme extends WP_UnitTestCase {
 	 * @coversNothing
 	 */
 	public function test_readme_php_version() {
-		$this->markTestSkipped(
-			'Temporarily disabled. Test should be re-enabled once WordPress is fully compatible with PHP 8.0+.'
-		);
-
 		// This test is designed to only run on trunk.
 		$this->skipOnAutomatedBranches();