Bump org.codehaus.groovy:groovy-all from 1.7.6 to 2.4.21 in /demo

Bumps [org.codehaus.groovy:groovy-all](https://github.com/apache/groovy) from 1.7.6 to 2.4.21.
- [Commits](https://github.com/apache/groovy/commits)

---
updated-dependencies:
- dependency-name: org.codehaus.groovy:groovy-all
  dependency-version: 2.4.21
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

demo/pom.xml

@@ -60,7 +60,7 @@
         <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-all</artifactId>
-            <version>1.7.6</version>
+            <version>2.4.21</version>
         </dependency>
         <dependency>
             <groupId>com.draagon</groupId>