patch 8.2.3294: Lua: memory leak when adding dict item fails

Problem:    Lua: memory leak when adding dict item fails.
Solution:   Free the typval and the dict item.
diff --git a/src/version.c b/src/version.c
index 2db7988..c2d3998 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3294,
+/**/
     3293,
 /**/
     3292,