patch 8.2.4873: Vim9: using "else" differs from using "endif/if !cond"

Problem:    Vim9: using "else" differs from using "endif/if !cond".
Solution:   Leave the block and enter another one. (closes #10320)
diff --git a/src/version.c b/src/version.c
index 5ad7551..3242c14 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4873,
+/**/
     4872,
 /**/
     4871,