patch 8.2.2721: Vim9: cannot have a linebreak inside a lambda

Problem:    Vim9: cannot have a linebreak inside a lambda.
Solution:   Compile the expression before the arguments.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2721,
 /**/
     2720,
 /**/