Updated flutter driver from 2.5.0 to 2.6.0

Author: budtmo

Appium/Dockerfile

@@ -147,7 +147,7 @@ USER 1300:1301
 # Install basic Android drivers
 #===============================
 ENV APPIUM_DRIVER_ESPRESSO_VERSION="2.38.2"
-ENV APPIUM_DRIVER_FLUTTER_VERSION="2.5.0"
+ENV APPIUM_DRIVER_FLUTTER_VERSION="2.6.0"
 ENV APPIUM_DRIVER_GECKO_VERSION="1.3.1"
 ENV APPIUM_DRIVER_UIAUTOMATOR2_VERSION="3.0.2"
 RUN appium driver install --source=npm appium-espresso-driver@${APPIUM_DRIVER_ESPRESSO_VERSION} && \