Support utest 0.7.4

Now to run asynchronous tests it's not needed the patched
utest from the master branch.
Using utest 0.7.4 and having the EventLoop runnable multiple
times, it is run after every test.

Author: lolgab

build.sbt

@@ -44,7 +44,7 @@ lazy val commonSettings = Seq(
     "-Ywarn-unused-import"
   ),
   Compile / doc / scalacOptions -= "-Xfatal-warnings",
-  libraryDependencies += "com.lihaoyi" %%% "utest" % "0.7.5-SNAPSHOT" % Test,
+  libraryDependencies += "com.lihaoyi" %%% "utest" % "0.7.4" % Test,
   testFrameworks += new TestFramework("utest.runner.Framework"),
   Test / nativeLinkStubs := true,
   publish / skip := true,

core/src/test/scala/scala/scalanative/loop/LoopTestSuite.scala

@@ -0,0 +1,9 @@
+package scala.scalanative.loop
+
+import utest._
+
+abstract class LoopTestSuite extends TestSuite {
+  override def utestAfterEach(path: Seq[String]): Unit = {
+    EventLoop.run()
+  }
+}

core/src/test/scala/scala/scalanative/loop/TimerTests.scala

@@ -5,7 +5,7 @@ import scala.concurrent.duration._
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.Promise
 
-object TimerTests extends TestSuite {
+object TimerTests extends LoopTestSuite {
   val tests = Tests {
     def now(): Duration = System.currentTimeMillis().millis
     val d               = 200.millis