Bump log4j-core from 2.13.3 to 2.15.0

Bumps log4j-core from 2.13.3 to 2.15.0.

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

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

pom.xml

@@ -15,7 +15,7 @@
 		<java.version>11</java.version>
 		<org.junit.jupiter>5.3.0-M1</org.junit.jupiter>
 		<org.slf4j>1.7.21</org.slf4j>
-		<org.apache.logging.log4j>2.13.3</org.apache.logging.log4j>
+		<org.apache.logging.log4j>2.15.0</org.apache.logging.log4j>
 
 		<timestamp>${maven.build.timestamp}</timestamp>
 		<maven.build.timestamp.format>yyyy-MM-dd HH:mm:ss</maven.build.timestamp.format>