Update scalatest to 3.2.19 (#159)

Co-authored-by: Karl F Walkow <[email protected]>

Author: scala-steward

build.sbt

@@ -87,7 +87,7 @@ lazy val matr_tests = crossProject(JVMPlatform)
       libraryDependencies ++=
          Seq(
             "org.typelevel" %% "spire" % "0.18.0" % Test,
-            "org.scalatest" %% "scalatest" % "3.2.16" % Test,
+            "org.scalatest" %% "scalatest" % "3.2.19" % Test,
             "org.scalatestplus" %% "scalacheck-1-16" % "3.2.14.0" % Test
          ),
       publish / skip := true