[Java] Upgrade to Gradle 5.4.1.

Author: mjpt777

build.gradle

@@ -765,6 +765,6 @@ task uploadToMavenCentral {
 }
 
 wrapper {
-    gradleVersion = '5.3.1'
+    gradleVersion = '5.4.1'
     distributionType = 'ALL'
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.3.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists