patch 8.2.2666: Vim9: not enough function arguments checked for string

Problem:    Vim9: not enough function arguments checked for string.
Solution:   Check in ch_logfile(), char2nr() and others.
diff --git a/src/version.c b/src/version.c
index 8e04e9a..da9073c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2666,
+/**/
     2665,
 /**/
     2664,