patch 8.2.3091: Vim9: default argument expr. cannot use previous argument

Problem:    Vim9: default argument expression cannot use previous argument
Solution:   Correct argument index. (closes #8496)
diff --git a/src/version.c b/src/version.c
index 0cefeba..5f07483 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3091,
+/**/
     3090,
 /**/
     3089,