Read latest nightly metadata from the scala3-compiler artefact

Co-authored-by: Guillaume Martres <[email protected]>

Author: anatoliykmetyuk

sbt-dotty/src/dotty/tools/sbtplugin/DottyPlugin.scala

@@ -35,7 +35,7 @@ object DottyPlugin extends AutoPlugin {
 
         // get latest nightly version from maven
         def fetchSource(version: String): (scala.io.BufferedSource, String) =
-          try Source.fromURL(s"https://repo1.maven.org/maven2/org/scala-lang/scala3_$version/maven-metadata.xml") -> version
+          try Source.fromURL(s"https://repo1.maven.org/maven2/org/scala-lang/scala3-compiler_$version/maven-metadata.xml") -> version
           catch { case t: java.io.FileNotFoundException =>
             val major :: minor :: Nil = version.split('.').toList
             if (minor.toInt <= 0) throw t