Merge pull request #5818 from dotty-staging/fix/build

Fix build: ImplicitConverter has been renamed Conversion

Author: smarter

tests/pos/i2339.scala

@@ -1,6 +1,6 @@
 import scala.collection.mutable
 
-case class Foo[K, V]()(implicit conv: ImplicitConverter[V, Ordered[V]])
+case class Foo[K, V]()(implicit conv: Conversion[V, Ordered[V]])
 extends mutable.HashMap[K,V] {
 
   val a = this.toSeq.sortWith { case ((_, v1), (_, v2)) => v1 > v2 }