patch 8.2.1869: Vim9: memory leak when using add()

Problem:    Vim9: memory leak when using add().
Solution:   Free the added item.
diff --git a/src/version.c b/src/version.c
index 90ab88a..a0bc135 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1869,
+/**/
     1868,
 /**/
     1867,