Upgrade to Groovy 2.5.0

Closes gh-13670

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -62,7 +62,7 @@
 		<freemarker.version>2.3.28</freemarker.version>
 		<elasticsearch.version>6.2.4</elasticsearch.version>
 		<glassfish-el.version>3.0.0</glassfish-el.version>
-		<groovy.version>2.4.15</groovy.version>
+		<groovy.version>2.5.0</groovy.version>
 		<gson.version>2.8.5</gson.version>
 		<h2.version>1.4.197</h2.version>
 		<hamcrest.version>1.3</hamcrest.version>