patch 8.2.2082: Vim9: can still use the depricated #{} dict syntax

Problem:    Vim9: can still use the depricated #{} dict syntax.
Solution:   Remove support for #{} in Vim9 script. (closes #7406, closes #7405)

src/eval.c

@@ -3254,7 +3254,7 @@ eval7(
     /*
      * Dictionary: #{key: val, key: val}
      */
-    case '#':	if ((*arg)[1] == '{')
+    case '#':	if (!in_vim9script() && (*arg)[1] == '{')
 		{
 		    ++*arg;
 		    ret = eval_dict(arg, rettv, evalarg, TRUE);