Update scalatest to 3.2.18 (apache#480)

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

Author: scala-steward-asf[bot]

project/Dependencies.scala

@@ -28,7 +28,7 @@ object Dependencies {
   val h2specUrl =
     s"https://github.com/summerwind/h2spec/releases/download/v$h2specVersion/$h2specName.$h2specArtifactExtension"
 
-  val scalaTestVersion = "3.2.17"
+  val scalaTestVersion = "3.2.18"
   val scalaCheckVersion = "1.17.0"
 
   val scalafixVersion = _root_.scalafix.sbt.BuildInfo.scalafixVersion // grab from plugin