patch 8.2.2724: Vim9: concatenating to list in dict not tested

Problem:    Vim9: concatenating to list in dict not tested.
Solution:   Add a test. (issue #8068)
diff --git a/src/version.c b/src/version.c
index 9696f5a..ef8f999 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2724,
+/**/
     2723,
 /**/
     2722,