Update the Dokerfile

[akkuldn]

Selenium manager has been integrated into selenium starting from Selenium 4.10. Selenium now automatically installs the required chromedriver or geckodriver for the Browser present. Also, if the desired Browser is not found then it automatically sets up the latest version of that Browser, downloads the driver for it and runs the test on it. We can update our Dockerfile to remove the steps to setup the Browser and its associated driver.