Issue #2662: Bump version to v4.3.

Author: mcomella

app/build.gradle

@@ -25,7 +25,7 @@ android {
         targetSdkVersion 28
         versionCode 11 // This versionCode is "frozen" for local builds. For "release" builds we
         // override this with a generated versionCode at build time.
-        versionName "4.3-LAT2"
+        versionName "4.3"
         testInstrumentationRunner "org.mozilla.tv.firefox.FirefoxOnDeviceTestRunner"
         testInstrumentationRunnerArguments clearPackageData: 'true'