patch 8.2.2744: Vim9: no way to explicitly ignore an argument

Problem:    Vim9: no way to explicitly ignore an argument.
Solution:   Use the underscore as the name for an ignored argument.
diff --git a/src/version.c b/src/version.c
index a22312a..d5a9dc7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2744,
+/**/
     2743,
 /**/
     2742,