patch 8.2.2736: Vim9: for loop over string is a bit slow

Problem:    Vim9: for loop over string is a bit slow.
Solution:   Avoid using strlen().

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2736,
 /**/
     2735,
 /**/