Merge pull request #92 from scala-steward/update/specs2-scalacheck-4.3.6

Update specs2-scalacheck to 4.3.6

build.sbt

@@ -280,7 +280,7 @@ lazy val offlineTest = project.in(file("tests/offline"))
   .settings(
     isabellePackage := "tests",
     parallelExecution in Test := false,
-    libraryDependencies += "org.specs2" %% "specs2-scalacheck" % "4.3.0"
+    libraryDependencies += "org.specs2" %% "specs2-scalacheck" % "4.3.6"
   )
 
 lazy val pureTest = project.in(file("tests/pure"))