patch 8.2.0704: Vim9: memory leak in disassemble test

Problem:    Vim9: memory leak in disassemble test.
Solution:   Decrement refcount when creating funccal.
diff --git a/src/version.c b/src/version.c
index b507c89..f22b37d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    704,
+/**/
     703,
 /**/
     702,