patch 8.2.1012: Vim9: cannot declare single character script variables

Problem:    Vim9: cannot declare single character script variables.
Solution:   Don't see "b:", "s:", etc. as namespace.  Fix item size of
            sn_var_vals.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1012,
 /**/
     1011,
 /**/