patch 8.2.3631: "syntax enable" does not work properly in Vim9 context

Problem:    "syntax enable" does not work properly in Vim9 context.
Solution:   Also handle Vim9 context. (closes #9161)
diff --git a/src/version.c b/src/version.c
index 4fb0e9e..79eb94f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3631,
+/**/
     3630,
 /**/
     3629,