Update scalatest to 3.2.20

Author: scala-steward

build.sbt

@@ -22,7 +22,7 @@ libraryDependencies ++= Seq(
   "com.evolutiongaming" %% "future-helper" % "1.0.6",
   "com.typesafe.akka"   %% "akka-actor"    % "2.6.8",
   "com.typesafe.akka"   %% "akka-testkit"  % "2.6.8" % Test,
-  "org.scalatest"       %% "scalatest"     % "3.2.9"  % Test)
+  "org.scalatest"       %% "scalatest"     % "3.2.20"  % Test)
 
 licenses := Seq(("MIT", url("https://opensource.org/licenses/MIT")))