Bump org.apache.velocity:velocity-engine-core from 2.3 to 2.4

Bumps org.apache.velocity:velocity-engine-core from 2.3 to 2.4.

---
updated-dependencies:
- dependency-name: org.apache.velocity:velocity-engine-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

doxia-site-renderer/pom.xml

@@ -33,7 +33,7 @@ under the License.
   <description>The Site Renderer handles the rendering of sites, merging site model with document content.</description>
 
   <properties>
-    <velocityEngineVersion>2.3</velocityEngineVersion>
+    <velocityEngineVersion>2.4</velocityEngineVersion>
     <velocityToolsVersion>3.1</velocityToolsVersion>
   </properties>