patch 8.2.4224: Vim9: no error when using a number for map() second argument

Problem:    Vim9: no error when using a number for map() second argument
Solution:   Disallow number to string conversion. (closes #9630)
diff --git a/src/version.c b/src/version.c
index e6f8b3a..9869aa0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4224,
+/**/
     4223,
 /**/
     4222,