Bump log4j-core from 2.14.1 to 2.15.0

Bumps log4j-core from 2.14.1 to 2.15.0.

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:production
...

Change-Id: I188e78f6cb449fd7404019978df6dd702e40be43
Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index e74ff5b..1822293 100644
--- a/pom.xml
+++ b/pom.xml
@@ -62,7 +62,7 @@
     <java.version>1.8</java.version>
     <jersey.version>3.0.2</jersey.version>
     <jackson.version>2.12.4</jackson.version>
-    <log4j.version>2.14.1</log4j.version>
+    <log4j.version>2.15.0</log4j.version>
     <lucene.version>5.0.0</lucene.version>
     <cobertura.version>2.7</cobertura.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>