Update gradle to 4.3 (#822)

(cherry picked from commit 6484142)

Author: Bogdan Drutu

gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.0.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.3-bin.zip