patch 8.2.2605: Vim9: string index and slice does not include composing chars

Problem:    Vim9: string index and slice does not include composing chars.
Solution:   Include composing characters. (issue #6563)
diff --git a/src/version.c b/src/version.c
index b4307fb..c5797c3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2605,
+/**/
     2604,
 /**/
     2603,