patch 8.2.3711: Vim9: memory leak when compiling :elseif fails

Problem:    Vim9: memory leak when compiling :elseif fails.
Solution:   Cleanup ppconst.
diff --git a/src/version.c b/src/version.c
index 37d3832..4890e2c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3711,
+/**/
     3710,
 /**/
     3709,