patch 8.2.1256: Vim9: type wrong after getting dict item in lambda

Problem:    Vim9: type wrong after getting dict item in lambda.
Solution:   Set the type to "any" after enforcing dict type. (closes #6491)
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 7feec38..b68eb3e 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1176,6 +1176,10 @@
   let dl = [{'key': 0}, {'key': 22}]->filter({ _, v -> v['key'] })
   assert_equal([{'key': 22}], dl)
 
+  dl = [{'key': 12}, {'foo': 34}]
+  assert_equal([{'key': 12}], filter(dl,
+	{_, v -> has_key(v, 'key') ? v['key'] == 12 : 0}))
+
   call CheckDefFailure(["filter([1, 2], {k,v -> 1})"], 'E1069:')
 enddef