Update yoast/phpunit-polyfills requirement from ^2.0 to ^4.0 in the dev-dependencies group #126

Job	Run time
PHPCS (PHP 8.3)	23s
Psalm Static Analysis (PHP 8.3)	19s
Security Scan (PHP 8.3)	22s
WP VIP CS (PHP 8.3)	20s
WP Plugin Check (PHP 8.3)	2m 3s
PHPStan for WP (PHP 8.3)	17s
PHPMD (PHP 8.3)	15s
Test WordPress nightly with PHP 7.4	1m 18s
Test WordPress latest with PHP 7.4	1m 9s
Test WordPress 6.6 with PHP 8.3	1m 10s
Test WordPress latest with PHP 8.0	1m 11s
Test WordPress nightly with PHP 8.0	1m 4s
Test WordPress latest with PHP 8.3	1m 4s
Test WordPress 6.6 with PHP 7.4	1m 9s
Test WordPress nightly with PHP 8.3	1m 12s
Test WordPress 6.6 with PHP 8.0	1m 2s
Test WordPress nightly with PHP 8.5	1m 12s
Test WordPress latest with PHP 8.5	1m 10s
Test WordPress 6.6 with PHP 8.5	1m 6s
Test WordPress latest with PHP 8.4	1m 9s
Test WordPress nightly with PHP 8.4	1m 12s
Test WordPress 6.6 with PHP 8.4	1m 14s
	21m 21s

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