patch 8.2.2618: Vim9: cannot use a normal list name to store function refs

Problem:    Vim9: cannot use a normal list name to store function refs.
Solution:   Allow a lower case name if it is indexed.
diff --git a/src/version.c b/src/version.c
index 3bb4ece..6ac96ac 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2618,
+/**/
     2617,
 /**/
     2616,