feat: update ruby lib core to v9

[KazuCocoa]

• https://github.com/appium/ruby_lib_core/blob/master/CHANGELOG.md#900---2024-05-14

This driver uses opts = Appium.symbolize_keys opts explicitly thus I think this won't change the usage: https://github.com/appium/ruby_lib/blob/50bca8f8acd2c4c144684cd33dd0ea9787a40bf5/lib/appium_lib/driver.rb#L164