Bump dependency.log4j2.version from 2.20.0 to 2.21.1

Bumps `dependency.log4j2.version` from 2.20.0 to 2.21.1.

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

Updates `org.apache.logging.log4j:log4j-slf4j-impl` from 2.20.0 to 2.21.1

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-core
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: org.apache.logging.log4j:log4j-slf4j-impl
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -40,7 +40,7 @@
         <dependency.camel.version>3.20.4</dependency.camel.version>
 
         <dependency.commons-logging.version>1.2</dependency.commons-logging.version>
-        <dependency.log4j2.version>2.20.0</dependency.log4j2.version>
+        <dependency.log4j2.version>2.21.1</dependency.log4j2.version>
 
         <dependency.jackson.version>2.15.2</dependency.jackson.version>
         <dependency.jackson-databind.version>${dependency.jackson.version}</dependency.jackson-databind.version>