Update selenium example to selenium 4.0

[rueyaa332266]

The newest major version of Selenium 4.0 was released, and some specifications had been changed. Updating the example to follow the latest version. Also fix some out-of-date procedures in the example’s README.

These changes are follow in the latest Selenium README: https://github.com/SeleniumHQ/docker-selenium

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[rueyaa332266]

/assign @sebgoa

[idvoretskyi]

Thanks @rueyaa332266!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: idvoretskyi, rueyaa332266

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