patch 8.2.3308: Vim9: no runtime check for argument type with varargs only

Problem:    Vim9: no runtime check for argument type if a function only has
            varargs.
Solution:   Also check argument types if uf_va_type is set. (closes #8715)
diff --git a/src/version.c b/src/version.c
index 9d5ede5..867d894 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3308,
+/**/
     3307,
 /**/
     3306,