Bump org.apache.logging.log4j:log4j-api from 2.20.0 to 2.21.0 (#254)

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

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

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gradle/libs.versions.toml

@@ -3,7 +3,7 @@
 [versions]
 lombok-version = "1.18.30"
 jetbrains-annotations-version = "24.0.1"
-log4j2-version = "2.20.0"
+log4j2-version = "2.21.0"
 
 minecraftVersion = "1.20.2"
 fabric-loader-version = "0.14.22"