Update log4j2.version to v2.20.0 (#3199)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

metrics-log4j2/pom.xml

@@ -17,7 +17,7 @@
 
     <properties>
         <javaModuleName>com.codahale.metrics.log4j2</javaModuleName>
-        <log4j2.version>2.19.0</log4j2.version>
+        <log4j2.version>2.20.0</log4j2.version>
     </properties>
 
     <build>