Upgrade Gradle to version 5.6.2

See https://github.com/gradle/gradle/releases/tag/v5.6.2.

Signed-off-by: Sebastian Schuberth <sebastian.schuberth@bosch-si.com>

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists