deps: update log4japi to v2.21.0

renovate[bot] · sschuberth · commit 9df7766a9bf9 · 2023-10-17T09:42:25.000+02:00
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -37,7 +37,7 @@ kotlinxCoroutines = "1.7.3"
 kotlinxHtml = "0.9.1"
 kotlinxSerialization = "1.6.0"
 ktor = "2.3.5"
-log4jApi = "2.20.0"
+log4jApi = "2.21.0"
 log4jApiKotlin = "1.3.0"
 logback = "1.4.11"
 maven = "3.9.5"
