Build: Fix Chrome beta tests

[mgol]

Summary

Chrome beta requires a chromedriver version matching its major version part; otherwise, it may fail to launch. Make sure a proper version is downloaded and added to PATH.

This fixes failures like https://github.com/jquery/jquery/actions/runs/19998370214/job/57349646406.

Example successful build on my fork: https://github.com/mgol/jquery/actions/runs/20078257228/job/57598352719

Checklist

• ~~New tests have been added to show the fix or feature works~~
• ~~If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com~~