Upgrade to Log4J 2.23.1

Closes gh-433

Author: snicoll

pom.xml

@@ -35,7 +35,7 @@
 		<aspectj.version>1.9.22</aspectj.version>
 		<assertj.version>3.25.3</assertj.version>
 		<junit-jupiter.version>5.10.2</junit-jupiter.version>
-		<log4j.version>2.21.1</log4j.version>
+		<log4j.version>2.23.1</log4j.version>
 		<mockito.version>5.7.0</mockito.version>
 		<spring.framework.version>6.0.15</spring.framework.version>
 	</properties>