patch 8.2.1421: Vim9: handling "+" and "-" before number differs from script

Problem:    Vim9: handling "+" and "-" before number differs from Vim script.
Solution:   Use the same sequence of commands.
diff --git a/src/version.c b/src/version.c
index a31436b..7411bc0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1421,
+/**/
     1420,
 /**/
     1419,