chore(deps-dev): bump log4j.version from 2.20.0 to 2.21.0 (#170)

Bumps `log4j.version` from 2.20.0 to 2.21.0.

Updates `org.apache.logging.log4j:log4j-slf4j-impl` from 2.20.0 to 2.21.0

Updates `org.apache.logging.log4j:log4j-core` from 2.20.0 to 2.21.0

---
updated-dependencies:
- dependency-name: org.apache.logging.log4j:log4j-slf4j-impl
  dependency-type: direct:development
  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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -42,7 +42,7 @@
         <junit.version>5.10.0</junit.version>
         <fabric8-client.version>6.7.2</fabric8-client.version>
         <slf4j.version>1.7.36</slf4j.version>
-        <log4j.version>2.20.0</log4j.version>
+        <log4j.version>2.21.0</log4j.version>
         <mokito.version>5.6.0</mokito.version>
         <mokito.version>5.2.0</mokito.version>
         <dekorate.version>3.7.0</dekorate.version>