Upgrade to Gradle 4.10.2

Due to an upgrade of the Artifactory publication plugin on the CI
server, we need to upgrade the build for 4.3.x to Gradle 4.x.

Closes gh-24392

spring-context/src/test/resources/org/springframework/scripting/groovy/ScriptBean.groovy

@@ -1,3 +1,5 @@
+package org.springframework.scripting.groovy;
+
 import org.springframework.context.ApplicationContext
 import org.springframework.context.ApplicationContextAware
 import org.springframework.scripting.ContextScriptBean

spring-context/src/test/resources/org/springframework/scripting/groovy/TestFactoryBean.groovy

@@ -1,3 +1,5 @@
+package org.springframework.scripting.groovy;
+
 import org.springframework.beans.factory.FactoryBean
 
 class TestFactoryBean implements FactoryBean {

spring-context/src/test/resources/org/springframework/scripting/groovy/simple.groovy

@@ -1 +1,3 @@
+package org.springframework.scripting.groovy;
+
 return 3 * 2