patch 8.2.3001: Vim9: memory leak when compilation fails

Problem:    Vim9: memory leak when compilation fails.
Solution:   Free the list of variable names.
diff --git a/src/version.c b/src/version.c
index 3e33c5d..3696c2e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3001,
+/**/
     3000,
 /**/
     2999,