Update logback-classic to 1.5.20 (#1262)

Co-authored-by: scala-steward-asf[bot] <147768647+scala-steward-asf[bot]@users.noreply.github.com>

Author: scala-steward-asf[bot]

project/Dependencies.scala

@@ -46,7 +46,7 @@ object Dependencies {
   // Legacy versions support Slf4J v1 for compatibility with older libs
   val Slf4jVersion = "2.0.17"
   val Slf4jLegacyVersion = "1.7.36"
-  val LogbackVersion = "1.5.19"
+  val LogbackVersion = "1.5.20"
   val LogbackLegacyVersion = "1.2.13"
 
   /**