Revert "Disable protoquill"

This reverts commit ea8d8b6.

Author: odersky

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

@@ -75,7 +75,7 @@ class CommunityBuildTestC:
   // @Test def oslibWatch = projects.oslibWatch.run()
   @Test def playJson = projects.playJson.run()
   @Test def pprint = projects.pprint.run()
-  // @Test def protoquill = projects.protoquill.run()  // needs to fix new type inference errors
+  @Test def protoquill = projects.protoquill.run()
   @Test def requests = projects.requests.run()
   @Test def scalacheck = projects.scalacheck.run()
   @Test def scalaCollectionCompat = projects.scalaCollectionCompat.run()