Update scalatest to 3.2.18 (#413)

Co-authored-by: Erlend Hamnaberg <erlend@hamnaberg.net>

build.sbt

@@ -9,7 +9,7 @@ val Versions = new {
   val circe = "0.14.7"
   val discipline = "1.5.1"
   val scalaCheck = "1.18.0"
-  val scalaTest = "3.2.17"
+  val scalaTest = "3.2.18"
   val scalaTestPlus = "3.2.18.0"
   val snakeYaml = "2.2"
   val snakeYamlEngine = "2.7"