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

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

---
updated-dependencies:
- 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>

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 slf4j-version = "2.0.9"
-log4j2-version = "2.20.0"
+log4j2-version = "2.21.0"
 log4j2-slf4j-version = "2.21.0"
 picocli-version = "4.7.5"
 jackson-version = "2.15.3"