Re-enable utest

zio is still broken with failures at runtime.

Author: odersky

community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala

@@ -100,8 +100,8 @@ class CommunityBuildTestA extends CommunityBuildTest:
   @Test def stdLib213 = projects.stdLib213.run()
   @Test def ujson = projects.ujson.run()
   @Test def upickle = projects.upickle.run()
-  // @Test def utest = projects.utest.run()  // fails with an error involving `Classable`.
-  // @Test def zio = projects.zio.run()
+  @Test def utest = projects.utest.run()
+  //@Test def zio = projects.zio.run()  // fails with some runtime failures of non-advancing fibers
 end CommunityBuildTestA
 
 @Category(Array(classOf[TestCategory]))