Update scalatest to 3.2.20

Author: scala-steward

project/Deps.scala

@@ -4,7 +4,7 @@ import sbt._
 object Deps {
   import Def.{setting => s}
 
-  val scalatest = s("org.scalatest" %%% "scalatest" % "3.2.19")
+  val scalatest = s("org.scalatest" %%% "scalatest" % "3.2.20")
 
   val cats = new {
     val core   = s("org.typelevel" %%% "cats-core" % "2.13.0")