Updated expectations in test

Author: lefou

modules/core/src/test/scala/org/scalasteward/core/buildtool/mill/MillAlgTest.scala

@@ -33,6 +33,7 @@ class MillAlgTest extends FunSuite {
     val expected = initial.copy(
       trace = Vector(
         Cmd("read", s"$repoDir/.mill-version"),
+        Cmd("read", s"$repoDir/.config/mill-version"),
         Cmd("write", predef),
         Cmd(repoDir.toString :: millCmd),
         Cmd("rm", "-rf", predef)