Update Gradle wrapper to 5.6 (#232)

* Update Gradle wrapper to 5.6

* Upgrade shadowJar to 5.1 and increase JVM heap size

* Use Gradle binary on GCS

build.gradle

@@ -40,7 +40,7 @@ plugins {
   id 'net.ltgt.apt' version '0.19' apply false
   id 'net.ltgt.errorprone' version '0.6.1'
   id 'checkstyle'
-  id 'com.github.johnrengelman.shadow' version '5.0.0'
+  id 'com.github.johnrengelman.shadow' version '5.1.0'
 
   // NodeJs plugin
   id "com.moowork.node" version "1.2.0"
@@ -162,8 +162,8 @@ subprojects {
         attributes 'Main-Class': mainClass
       }
       zip64 = true
-      classifier = null
-      version = null
+      classifier = ''
+      archiveVersion = ''
       configurations = [project.configurations.runtimeClasspath]
       from project.sourceSets.main.output
       // Excludes signature files that accompany some dependency jars, like

gradle.properties

@@ -1,3 +1,4 @@
+org.gradle.jvmargs=-Xmx1024m
 mavenUrl=
 pluginsUrl=
 uploaderDestination=

gradle/dependency-locks/buildscript-classpath.lockfile

@@ -9,8 +9,8 @@ com.diffplug.gradle.spotless:com.diffplug.gradle.spotless.gradle.plugin:3.18.0
 com.diffplug.spotless:spotless-lib-extra:1.18.0
 com.diffplug.spotless:spotless-lib:1.18.0
 com.diffplug.spotless:spotless-plugin-gradle:3.18.0
-com.github.jengelman.gradle.plugins:shadow:5.0.0
-com.github.johnrengelman.shadow:com.github.johnrengelman.shadow.gradle.plugin:5.0.0
+com.github.jengelman.gradle.plugins:shadow:5.1.0
+com.github.johnrengelman.shadow:com.github.johnrengelman.shadow.gradle.plugin:5.1.0
 com.google.cloud.tools:appengine-gradle-plugin:2.0.1
 com.google.cloud.tools:appengine-plugins-core:0.7.5
 com.google.code.findbugs:jsr305:3.0.2

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.5.1-all.zip
+distributionUrl=https\://storage.googleapis.com/domain-registry-dev-deploy/gradle/gradle-5.6-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

prober/gradle/dependency-locks/buildscript-classpath.lockfile

@@ -0,0 +1,3 @@
+# This is a Gradle generated file for dependency locking.
+# Manual edits can break the build and are not advised.
+# This file is expected to be part of source control.