Issue #3139205: Re-enable Webform tests

Partial revert of db4154d7.

tests/src/Functional/PdfWebformPopulationTest.php

@@ -43,11 +43,6 @@ class PdfWebformPopulationTest extends FillPdfTestBase {
    * {@inheritdoc}
    */
   protected function setUp(): void {
-    // @todo Stop skipping this test when Webform has Drupal 9 support.
-    if (version_compare(substr(\Drupal::VERSION, 0, 1), 9, '>=')) {
-      $this->markTestSkipped('Webform is not yet compatible with Drupal 9, so skipping these tests.');
-    }
-
     parent::setUp();
 
     // Add some roles to this user.