patch 8.2.2628: Vim9: #{ can still be used at the script level

Problem:    Vim9: #{ can still be used at the script level.
Solution:   Give an error for #{ like in a :def function.
diff --git a/src/version.c b/src/version.c
index 7c4db55..bcf8b6d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2628,
+/**/
     2627,
 /**/
     2626,