patch 9.2.0057: memory leak in exe_newdict()

Problem:  memory leak in exe_newdict()
Solution: Free the variable item (Huihui Huang).

closes: #PR

Signed-off-by: Huihui Huang <625173@qq.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    57,
 /**/
     56,
 /**/

src/vim9execute.c

@@ -290,6 +290,7 @@ exe_newdict(int count, ectx_T *ectx)
 	    if (dict_add(dict, item) == FAIL)
 	    {
 		// can this ever happen?
+		dictitem_free(item);
 		dict_unref(dict);
 		return FAIL;
 	    }