chore: bump scala version to 2.3.18 (#552)

Author: He-Pin

build.mill

@@ -22,7 +22,7 @@ import mill.api.BuildCtx
 
 import java.util.Base64
 
-val scalaVersions: Seq[String] = Seq("3.3.7", "2.13.17")
+val scalaVersions: Seq[String] = Seq("3.3.7", "2.13.18")
 val jvmScalaVersions: Seq[String] = scalaVersions ++ Seq("2.12.20")
 val stackSize = "100m"
 val stackSizekBytes = 100 * 1024