Fix Webdrivers missing version error

[mihkelal]

Fixes this error when running feature specs:

Webdrivers::VersionError:
  Unable to find latest point release version for 115.0.5790. You appear to be using a non-production version of Chrome. Please set `Webdrivers::Chromedriver.required_version = <desired driver version>` to a known chromedriver version: https://chromedriver.storage.googleapis.com/index.html

From https://ruby.social/@ajaya/110806302052230819:

Now that Chrome 15 is out, folks using webdriver gem, will start getting errors like 'Unable to find latest point release version for 115.0.5790'. To solve this, follow along.

• Remove wedriver gem(Webdrivers trying to load a Chrome version that doesn't exist titusfortner/webdrivers#247 (comment))
• Upgrade selenium-webdriver, capybara gems

Also see rails/rails#48847.