patch 8.2.2598: Vim9: :open does not need to be supported

Problem:    Vim9: :open does not need to be supported.
Solution:   Do not support :open in Vim9 script.
diff --git a/src/version.c b/src/version.c
index f35f8b0..78eb634 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2598,
+/**/
     2597,
 /**/
     2596,