Best practices for SeleniumTestDriver which unfortunately there's no support yet in DTT as that should use the new driver WebDriver instead. So here's a workaround.

HomepageTest.php

<?php

  declare(strict_types=1);

  namespace Drupal\Tests\server_general\ExistingSite;

  use Symfony\Component\HttpFoundation\Response;

  /**
   * Tests for the Homepage.
   */
final class HomepageTest extends WebdriverTestBase {

    /**
     * Test the featured content carousel on homepage.
     */
    public function testFeaturedContentCarousel(): void {
      $this->drupalGet('<front>');

      $web_assert = $this->assertSession();

      $featured_content = $web_assert->waitForElement('css', '.paragraph--type--related-content');
      $this->assertNotNull($featured_content);

      $web_assert->elementTextContains('css', '.paragraph--type--related-content h2', 'Featured Content');

      $carousel = $web_assert->waitForElement('css', '.paragraph--type--related-content .carousel-wrapper.slick-initialized');
      $this->assertNotNull($carousel);

      $dots_2 = $carousel->find('css', '.slick-dots li:nth-child(2)');
      $this->assertNotNull($dots_2);
      $dots_2->click();

      $this->getSession()->wait(500);

      $web_assert->elementTextContains('css', '.paragraph--type--related-content .carousel-slide.slick-current', 'Pandemic Moves Education Online');
    }

  }

phpunit.xml

  <env name="DTT_WEBDRIVER_HOSTNAME" value="selenium-chrome"/>
  <env name="DTT_WEBDRIVER_PORT" value="4444"/>

<!--  The Chrome capabilities (--headless, --no-sandbox, etc.) and the binary path stay in WebdriverTestBase since they can't be configured via DTT_MINK_DRIVER_ARGS anyway — that's the whole reason the base class exists. -->

WebdriverTestBase.php

<?php

  declare(strict_types=1);

  namespace Drupal\Tests\server_general\ExistingSite;

  use Behat\Mink\Driver\DriverInterface;
  use Mink\WebdriverClassicDriver\WebdriverClassicDriver;
  use weitzman\DrupalTestTraits\ExistingSiteSelenium2DriverTestBase;

  /**
   * Base class for ExistingSite tests requiring JavaScript support.
   *
   * Uses WebdriverClassicDriver for Selenium 4 W3C protocol compatibility.
   * Extend this class instead of ExistingSiteSelenium2DriverTestBase.
   */
  abstract class WebdriverTestBase extends ExistingSiteSelenium2DriverTestBase {

    /**
     * {@inheritdoc}
     */
    protected function getDriverInstance(): DriverInterface {
      if (!isset($this->driver)) {
        $hostname = getenv('DTT_WEBDRIVER_HOSTNAME') ?: 'selenium-chrome';
        $port = getenv('DTT_WEBDRIVER_PORT') ?: '4444';

        $this->driver = new WebdriverClassicDriver('chrome', [
          'goog:chromeOptions' => [
            'binary' => '/usr/bin/chromium',
            'args' => [
              '--disable-dev-shm-usage',
              '--disable-gpu',
              '--headless',
              '--no-sandbox',
            ],
          ],
        ], "http://{$hostname}:{$port}");
      }

      return $this->driver;
    }

  }