Fix fd leak causing deleted files to remain open and eat disk space (#12693)

This was introduced in v7.2 by #11248

src/replication.c

@@ -2250,6 +2250,7 @@ void readSyncBulkPayload(connection *conn) {
         }
 
         zfree(server.repl_transfer_tmpfile);
+        close(server.repl_transfer_fd);
         server.repl_transfer_fd = -1;
         server.repl_transfer_tmpfile = NULL;
     }