Move to Gradle 4.4

Test: ./gradlew buildOnServer
Change-Id: I4285cfef831bc2a54cd330f49da6d0955b51ad71
diff --git a/app-toolkit/gradle/wrapper/gradle-wrapper.properties b/app-toolkit/gradle/wrapper/gradle-wrapper.properties
index 9d09896..79f002a 100644
--- a/app-toolkit/gradle/wrapper/gradle-wrapper.properties
+++ b/app-toolkit/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=../../../../../tools/external/gradle/gradle-4.3-bin.zip
+distributionUrl=../../../../../tools/external/gradle/gradle-4.4-bin.zip
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 96e6dab..e355705 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=../../../../tools/external/gradle/gradle-4.3-bin.zip
+distributionUrl=../../../../tools/external/gradle/gradle-4.4-bin.zip