Upgrade the default `geckodriver` version to `0.35.0`

[mdmintz]

Upgrade the default geckodriver version to 0.35.0

There's a new geckodriver: https://github.com/mozilla/geckodriver/releases/tag/v0.35.0

• sbase get geckodriver should now download that version by default, (if tests pass)

[mdmintz]

This was resolved in 4.29.7 - https://github.com/seleniumbase/SeleniumBase/releases/tag/v4.29.7