Bump log4j-core from 2.14.1 to 2.16.0

Bumps log4j-core from 2.14.1 to 2.16.0.

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle

@@ -77,7 +77,7 @@ dependencies {
     compile "org.grails.plugins:cache"
     compile "org.hibernate:hibernate-ehcache"
     compile "org.apache.logging.log4j:log4j-api:2.14.1"
-    compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.14.1'
+    compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.16.0'
     compile "org.elasticsearch:elasticsearch:${elasticsearchVersion}"
     compile group: 'org.elasticsearch.client', name: 'elasticsearch-rest-client', version: elasticsearchVersion
     compile group: 'org.elasticsearch.client', name: 'elasticsearch-rest-high-level-client', version: elasticsearchVersion