Bump log4j2.version from 2.21.1 to 2.23.1

Bumps `log4j2.version` from 2.21.1 to 2.23.1.

Updates `org.apache.logging.log4j:log4j-bom` from 2.21.1 to 2.23.1
- [Release notes](https://github.com/apache/logging-log4j2/releases)
- [Changelog](https://github.com/apache/logging-log4j2/blob/2.x/RELEASE-NOTES.adoc)
- [Commits](https://github.com/apache/logging-log4j2/compare/rel/2.21.1...rel/2.23.1)

Updates `org.apache.logging.log4j:log4j-core` from 2.21.1 to 2.23.1

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 83950df..46e6f09 100644
--- a/pom.xml
+++ b/pom.xml
@@ -169,7 +169,7 @@
     <json.version>20240303</json.version>
     <junit.version>4.13.2</junit.version>
     <jxr.plugin.version>2.5</jxr.plugin.version>
-    <log4j2.version>2.21.1</log4j2.version>
+    <log4j2.version>2.23.1</log4j2.version>
     <mockito.version>5.11.0</mockito.version>
     <plexus-utils.version>4.0.0</plexus-utils.version>
     <postgresql.version>42.7.2</postgresql.version>