patch 8.2.2654: Vim9: getting a character from a string can be slow

Problem:    Vim9: getting a character from a string can be slow.
Solution:   Avoid a function call to get the character byte size. (#8000)
diff --git a/src/version.c b/src/version.c
index 37da6ab..5e177f0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2654,
+/**/
     2653,
 /**/
     2652,