patch 8.2.0730: Vim9: Assignment to dict member does not work

Problem:    Vim9: Assignment to dict member does not work.
Solution:   Parse dict assignment. Implement getting dict member.
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index d1cc1f9..0b99eec 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -38,7 +38,7 @@
 
   call CheckDefFailure(['let x:string'], 'E1069:')
   call CheckDefFailure(['let x:string = "x"'], 'E1069:')
-  call CheckDefFailure(['let a:string = "x"'], 'E1082:')
+  call CheckDefFailure(['let a:string = "x"'], 'E1069:')
 
   let a: number = 6
   assert_equal(6, a)