Upgrade gradle to 6.6.1

Author: oliemansm

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Thu Nov 14 18:53:34 CET 2019
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists