Bump sbt to 1.4.9

Author: griggt

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -121,7 +121,7 @@ final case class SbtCommunityProject(
       case Some(ivyHome) => List(s"-Dsbt.ivy.home=$ivyHome")
       case _ => Nil
     extraSbtArgs ++ sbtProps ++ List(
-      "-sbt-version", "1.4.7",
+      "-sbt-version", "1.4.9",
       "-Dsbt.supershell=false",
       s"-Ddotty.communitybuild.dir=$communitybuildDir",
       s"--addPluginSbtFile=$sbtPluginFilePath"

project/build.properties

@@ -1 +1 @@
-sbt.version=1.4.7
+sbt.version=1.4.9