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

Bumps [org.apache.logging.log4j:log4j-bom](https://github.com/apache/logging-log4j2) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/apache/logging-log4j2/releases)
- [Commits](apache/logging-log4j2@rel/2.20.0...rel/2.21.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -48,7 +48,7 @@ javaPlatform {
 
 dependencies {
     api platform('org.junit:junit-bom:5.10.0')
-    api platform('org.apache.logging.log4j:log4j-bom:2.20.0')
+    api platform('org.apache.logging.log4j:log4j-bom:2.21.0')
     api platform('org.glassfish.jersey:jersey-bom:3.1.3')
     api platform('com.fasterxml.jackson:jackson-bom:2.15.2')