fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHELOGGINGLOG4J-2314720

Author: snyk-bot

pom.xml

@@ -85,7 +85,7 @@
   	<dependency>
 		    <groupId>org.apache.logging.log4j</groupId>
 		    <artifactId>log4j-core</artifactId>
-		    <version>2.14.1</version>
+		    <version>2.15.0</version>
 	</dependency>
   	<dependency>
             <groupId>commons-lang</groupId>