Changes:

• Updated Appium to version 2.15.0
• Updated Appium driver: appium-espresso-driver@3.5.3
• Updated Appium driver: appium-flutter-driver@2.11.0
• Updated Appium driver: appium-geckodriver@1.4.1
• Updated Appium driver: appium-uiautomator2-driver@3.9.8