patch 8.2.4616: Vim9: Declarations in a {} block of a user command remain

Problem:    Vim9: Declarations in a {} block of a user command do not use Vim9
            rules if defined in a legacy script. (Yegappan Lakshmanan)
Solution:   Pretend the script is Vim9 script.
diff --git a/src/version.c b/src/version.c
index dd2330e..ba16773 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4616,
+/**/
     4615,
 /**/
     4614,