Update logback to 1.5.15 (#4192)

Author: lefou

build.mill

@@ -181,7 +181,7 @@ object Deps {
   val fansi = ivy"com.lihaoyi::fansi:0.5.0"
   val jarjarabrams = ivy"com.eed3si9n.jarjarabrams::jarjar-abrams-core:1.14.0"
   val requests = ivy"com.lihaoyi::requests:0.9.0"
-  val logback = ivy"ch.qos.logback:logback-classic:1.5.11"
+  val logback = ivy"ch.qos.logback:logback-classic:1.5.15"
   val sonatypeCentralClient = ivy"com.lumidion::sonatype-central-client-requests:0.3.0"
   val kotlinVersion = "2.0.21"
   val kotlinCompiler = ivy"org.jetbrains.kotlin:kotlin-compiler:$kotlinVersion"