patch 8.2.4301: Vim9: type error for copy of dict

Problem:    Vim9: type error for copy of dict.
Solution:   Do not use dict<any> but no type. (closes #9696)

src/dict.c

@@ -306,7 +306,10 @@ dict_copy(dict_T *orig, int deep, int top, int copyID)
 	    orig->dv_copyID = copyID;
 	    orig->dv_copydict = copy;
 	}
-	copy->dv_type = alloc_type(top || deep ? &t_dict_any : orig->dv_type);
+	if (orig->dv_type == NULL || top || deep)
+	    copy->dv_type = NULL;
+	else
+	    copy->dv_type = alloc_type(orig->dv_type);
 
 	todo = (int)orig->dv_hashtab.ht_used;
 	for (hi = orig->dv_hashtab.ht_array; todo > 0 && !got_int; ++hi)

src/testdir/test_vim9_builtin.vim

@@ -745,6 +745,9 @@ def Test_copy_return_type()
 
   var ndd: dict<dict<number>> = {a: {x: 1, y: 2}}
   assert_equal({x: 1, y: 2, z: 'x'}, ndd->deepcopy()['a']->extend({z: 'x'}))
+
+  var ldn: list<dict<number>> = [{a: 0}]->deepcopy()
+  assert_equal([{a: 0}], ldn)
 enddef
 
 def Test_count()

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4301,
 /**/
     4300,
 /**/