Update scalatest to 3.2.8 (#377)

[skip ci]

Author: scala-steward

project/Dependencies.scala

@@ -2,7 +2,7 @@ import sbt._
 
 object Dependencies {
 
-  val scalatestVersion = "3.2.7"
+  val scalatestVersion = "3.2.8"
 
   val commonLibraries = Seq(
     "org.mockito"   % "mockito-core"      % "3.6.0",