patch 8.2.3841: Vim9: outdated TODO items, disabled tests that work

Problem:    Vim9: outdated TODO items, disabled tests that work.
Solution:   Remove TODO items, run tests that work now.  Check that a dict
            item isn't locked.
diff --git a/src/version.c b/src/version.c
index fc30b89..5fffd73 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3841,
+/**/
     3840,
 /**/
     3839,