Update for Selenium Grid scaler

[VietND96]

Provide a description of what has been changed

An update for https://github.com/kedacore/keda/pull/6169 will come in the upcoming release v2.16. @SeleniumHQ involve as long term maintainer for the scaler

Checklist

• [x] Commits are signed with Developer Certificate of Origin (DCO)

Fixes #

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[VietND96]

Updated this to be aligned with the decision in core changes.

[JorTurFer]

Thanks a lot for your help and patience 🙇