patch 8.2.2760: Vim9: no error for changing a for loop variable

Problem:    Vim9: no error for changing a for loop variable.
Solution:   Make the loop variable read-only. (issue #8102)
diff --git a/src/version.c b/src/version.c
index fdb8d0a..4861ba1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2760,
+/**/
     2759,
 /**/
     2758,