Update utest to 0.8.9 (#410)

Pull request: #410

Author: scala-steward

build.mill

@@ -23,7 +23,7 @@ object Deps {
   val geny = mvn"com.lihaoyi::geny::1.1.1"
   val ant = mvn"org.apache.ant:ant:1.10.15"
   val sourcecode = mvn"com.lihaoyi::sourcecode::0.4.2"
-  val utest = mvn"com.lihaoyi::utest::0.8.4"
+  val utest = mvn"com.lihaoyi::utest::0.8.9"
   val expecty = mvn"com.eed3si9n.expecty::expecty::0.16.0"
   def scalaReflect(scalaVersion: String) = mvn"org.scala-lang:scala-reflect:$scalaVersion"
   def scalaLibrary(version: String) = mvn"org.scala-lang:scala-library:${version}"