Update spark-core, spark-mllib to 3.5.6

Author: scala-steward

build.sbt

@@ -24,7 +24,7 @@ version := "0.1.0-SNAPSHOT"
 
 val scioVersion = "0.13.5"
 val scaldingVersion = "0.17.4"
-val sparkVersion = "3.5.0"
+val sparkVersion = "3.5.6"
 val algebirdVersion = "0.13.10"
 val scalacheckVersion = "1.17.0"
 val scalameterVersion = "0.19"