Update logback-classic to 1.5.20 (#355)

Co-authored-by: scala-steward-asf[bot] <147768647+scala-steward-asf[bot]@users.noreply.github.com>
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index b2638a5..3c73ac6 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -17,7 +17,7 @@
 
   val PekkoVersion = PekkoCoreDependency.version
 
-  val LogbackVersion = "1.5.19"
+  val LogbackVersion = "1.5.20"
 
   val SlickVersion = "3.6.1"
   val SlickDocVersion = SlickVersion