patch 8.2.1461: Vim9: string indexes are counted in bytes

Problem:    Vim9: string indexes are counted in bytes.
Solution:   Use character indexes. (closes #6574)
diff --git a/src/version.c b/src/version.c
index 06c6995..1353360 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1461,
+/**/
     1460,
 /**/
     1459,