patch 8.2.1865: Vim9: add() does not check type of argument

Problem:    Vim9: add() does not check type of argument.
Solution:   Inline the add() call. (closes #7160)
diff --git a/src/version.c b/src/version.c
index ef5ea87..2894ded 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1865,
+/**/
     1864,
 /**/
     1863,