Update logback-classic to 1.5.18

Author: aiven-scala-steward[bot]

build.sbt

@@ -20,7 +20,7 @@ val futilesVersion              = "2.0.2"
 val quillJdbcMonixVersion       = "3.7.2"
 val postgresqlJdbcVersion       = "42.7.3"
 val scalaLoggingVersion         = "3.9.5"
-val logbackClassicVersion       = "1.5.6"
+val logbackClassicVersion       = "1.5.18"
 val declineVersion              = "2.4.1"
 val pureConfigVersion           = "0.17.6"
 val scalaTestVersion            = "3.2.18"