bump Scala (2.13.6), ScalaTest (3.2.9) versions

Author: SethTisue

src/main/g8/build.sbt

@@ -2,9 +2,9 @@ lazy val root = (project in file(".")).
   settings(
     inThisBuild(List(
       organization := "com.example",
-      scalaVersion := "2.13.3"
+      scalaVersion := "2.13.6"
     )),
     name := "scalatest-example"
   )
 
-libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.2" % Test
+libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.9" % Test