Remove references to deprecated classes

`scala.{Traversable,TraversableOnce,BufferedIterator}` are deprecated
since 2.13.0. It seems these deprecated references where not found when
the check was performed after `FirstTransform` as the types might have
been dealiased in the `TypeTree`.

compiler/src/dotty/tools/dotc/config/PathResolver.scala

@@ -211,7 +211,7 @@ class PathResolver(using c: Context) {
     import classPathFactory._
 
     // Assemble the elements!
-    def basis: List[Traversable[ClassPath]] =
+    def basis: List[Iterable[ClassPath]] =
       val release = Option(ctx.settings.javaOutputVersion.value).filter(_.nonEmpty)
 
       List(

compiler/src/dotty/tools/dotc/core/SymDenotations.scala

@@ -299,7 +299,7 @@ object SymDenotations {
     }
 
     /** Add all given annotations to this symbol */
-    final def addAnnotations(annots: TraversableOnce[Annotation])(using Context): Unit =
+    final def addAnnotations(annots: IterableOnce[Annotation])(using Context): Unit =
       annots.iterator.foreach(addAnnotation)
 
     @tailrec

compiler/src/dotty/tools/dotc/parsing/xml/MarkupParserCommon.scala

@@ -11,8 +11,7 @@ package xml
 
 import Utility._
 import util.Chars.SU
-
-
+import scala.collection.BufferedIterator
 
 /** This is not a public trait - it contains common code shared
  *  between the library level XML parser and the compiler's.

compiler/src/dotty/tools/dotc/parsing/xml/MarkupParsers.scala

@@ -6,6 +6,7 @@ package xml
 import scala.language.unsafeNulls
 
 import scala.collection.mutable
+import scala.collection.BufferedIterator
 import core.Contexts.Context
 import mutable.{ Buffer, ArrayBuffer, ListBuffer }
 import scala.util.control.ControlThrowable

compiler/src/dotty/tools/dotc/printing/Printer.scala

@@ -174,15 +174,15 @@ abstract class Printer {
     atPrec(GlobalPrec) { elem.toText(this) }
 
   /** Render elements alternating with `sep` string */
-  def toText(elems: Traversable[Showable], sep: String): Text =
+  def toText(elems: Iterable[Showable], sep: String): Text =
     Text(elems map (_ toText this), sep)
 
   /** Render elements within highest precedence */
-  def toTextLocal(elems: Traversable[Showable], sep: String): Text =
+  def toTextLocal(elems: Iterable[Showable], sep: String): Text =
     atPrec(DotPrec) { toText(elems, sep) }
 
   /** Render elements within lowest precedence */
-  def toTextGlobal(elems: Traversable[Showable], sep: String): Text =
+  def toTextGlobal(elems: Iterable[Showable], sep: String): Text =
     atPrec(GlobalPrec) { toText(elems, sep) }
 
   /** A plain printer without any embellishments */

compiler/src/dotty/tools/dotc/printing/Texts.scala

@@ -173,7 +173,7 @@ object Texts {
     /** A concatenation of elements in `xs` and interspersed with
      *  separator strings `sep`.
      */
-    def apply(xs: Traversable[Text], sep: String = " "): Text =
+    def apply(xs: Iterable[Text], sep: String = " "): Text =
       if (sep == "\n") lines(xs)
       else {
         val ys = xs.filterNot(_.isEmpty)
@@ -182,7 +182,7 @@ object Texts {
       }
 
     /** The given texts `xs`, each on a separate line */
-    def lines(xs: Traversable[Text]): Vertical = Vertical(xs.toList.reverse)
+    def lines(xs: Iterable[Text]): Vertical = Vertical(xs.toList.reverse)
 
     extension (text: => Text)
       def provided(cond: Boolean): Text = if (cond) text else Str("")