fix(deps): update dependency ch.qos.logback:logback-classic to v1.3.15

Author: renovate[bot]

dependencyManagement/build.gradle.kts

@@ -83,7 +83,7 @@ val CORE_DEPENDENCIES = listOf(
 // this top level to help consistently satisfy large numbers of transitive dependencies.
 val DEPENDENCIES = listOf(
   "io.r2dbc:r2dbc-proxy:1.1.5.RELEASE",
-  "ch.qos.logback:logback-classic:1.3.14", // 1.4+ requires Java 11+
+  "ch.qos.logback:logback-classic:1.3.15", // 1.4+ requires Java 11+
   "com.github.stefanbirkner:system-lambda:1.2.1",
   "com.github.stefanbirkner:system-rules:1.19.0",
   "uk.org.webcompere:system-stubs-jupiter:2.0.3",