Add allow-plugins configuration for the two Composer plugins, in advance of the July 2022 requirement.
Switch from yoast/phpunit-polyfills to yoast/wp-test-utils which includes a newer version of PHPUnit Polyfills and some other bits useful for running WP / integration tests.
Remove PHPCS and PHPUnit direct dependencies as they are included via other direct dependencies.
allow-pluginsconfiguration for the two Composer plugins, in advance of the July 2022 requirement.yoast/phpunit-polyfillstoyoast/wp-test-utilswhich includes a newer version of PHPUnit Polyfills and some other bits useful for running WP / integration tests.