patch 8.2.3168: Vim9: type error for constant of type any

Problem:    Vim9: type error for constant of type any.
Solution:   Do add a runtime type check if a constant has type any.
            (closes #8570)

src/testdir/test_vim9_assign.vim

@@ -1667,6 +1667,16 @@ def Test_var_type_check()
     s:d = {}
   END
   CheckScriptSuccess(lines)
+
+  lines =<< trim END
+    vim9script
+    var d = {a: 1, b: [2]}
+    def Func(b: bool)
+      var l: list<number> = b ? d.b : [3]
+    enddef
+    defcompile
+  END
+  CheckScriptSuccess(lines)
 enddef
 
 let g:dict_number = #{one: 1, two: 2}