Update logback monorepo to v1.5.21 (#42)

Author: renovate[bot]

gradle/libs.versions.toml

@@ -15,7 +15,7 @@ kotlinxCoroutines = "1.10.2"
 junit = "5.14.1"
 lint-gradle = "1.0.0-alpha05"
 log4j = "2.25.2"
-logback = "1.4.5"
+logback = "1.5.21"
 mockito = "5.4.0"
 moshi = "1.15.2"
 picocli = "4.7.7"