Bump log4j2Version from 2.20.0 to 2.21.1

Bumps `log4j2Version` from 2.20.0 to 2.21.1.

Updates `org.apache.logging.log4j:log4j-api` from 2.20.0 to 2.21.1

Updates `org.apache.logging.log4j:log4j-core` from 2.20.0 to 2.21.1

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

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

dependencies.gradle

@@ -24,7 +24,7 @@ ext {
     jline3Version       = "3.23.0"
     junitDepVersion     = "4.11"
     junitVersion        = "4.13.2"
-    log4j2Version       = "2.20.0"
+    log4j2Version       = "2.21.1"
     springBootVersion   = "3.1.2" // Spring Boot 3.0 requires Java 17 as a minimum version
     systemRulesVersion  = "1.19.0"
     systemLambdaVersion = '1.2.1'