[JENKINS-52019] - Update Groovy from 2.4.11 to 2.4.12 to pick up fixes towards Java 11 support

core/pom.xml

@@ -41,7 +41,7 @@ THE SOFTWARE.
     <staplerFork>true</staplerFork>
     <stapler.version>1.254.1</stapler.version>
     <spring.version>2.5.6.SEC03</spring.version>
-    <groovy.version>2.4.11</groovy.version>
+    <groovy.version>2.4.12</groovy.version>
   </properties>
 
   <dependencies>