patch 8.2.2441: Vim9: extend() does not give an error for a type mismatch

Problem:    Vim9: extend() does not give an error for a type mismatch.
Solution:   Check the type of the second argument. (closes #7760)
diff --git a/src/version.c b/src/version.c
index c5074c2..5555c77 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2441,
+/**/
     2440,
 /**/
     2439,