patch 8.2.4056: Vim9: memory leak when exporting function in autoload script

Problem:    Vim9: memory leak when exporting function in autoload script.
Solution:   Fee the name if replacing it.

src/scriptfile.c

@@ -2210,6 +2210,7 @@ may_prefix_autoload(char_u *name)
 	    {
 		vim_snprintf((char *)res, len, "%s%s",
 					     si->sn_autoload_prefix, basename);
+		vim_free(name);
 		return res;
 	    }
 	}

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4056,
 /**/
     4055,
 /**/