build(deps): bump log4j from 2.20.0 to 2.23.1

Bumps `log4j` from 2.20.0 to 2.23.1.

Updates `org.apache.logging.log4j:log4j-api` from 2.20.0 to 2.23.1

Updates `org.apache.logging.log4j:log4j-core` from 2.20.0 to 2.23.1

Updates `org.apache.logging.log4j:log4j-slf4j2-impl` from 2.20.0 to 2.23.1

---
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
- dependency-name: org.apache.logging.log4j:log4j-slf4j2-impl
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ dokka = "1.9.20"
 okio = "3.3.0"
 ktor = "2.3.11"
 openjdk-jmh = "1.35"
-log4j = "2.20.0"
+log4j = "2.23.1"
 reactor = "3.6.2"
 # simbot
 simbot = "4.3.0"