fix: update Groovy to 2.4.21

diff --git a/src/it/MWAR-427_update-without-clean/pom.xml b/src/it/MWAR-427_update-without-clean/pom.xml
index a0d7146..07b1e17 100644
--- a/src/it/MWAR-427_update-without-clean/pom.xml
+++ b/src/it/MWAR-427_update-without-clean/pom.xml
@@ -58,6 +58,13 @@
             new File('src/main/webapp/root.html').renameTo 'src/main/webapp/index.html'
           </source>
         </configuration>
+        <dependencies>
+          <dependency>
+            <groupId>org.codehaus.groovy</groupId>
+            <artifactId>groovy-all</artifactId>
+            <version>2.4.21</version>
+          </dependency>
+        </dependencies>
       </plugin>
     </plugins>
   </build>