Use released Hazelcast 5.4.0 instead of SNAPSHOT (#1524)

Now `5.4.0` is released, the released version should be used in
preferences to a pre-release `SNAPSHOT`.

Author: JackPGreen

scripts/download-rc.js

@@ -1,6 +1,6 @@
 'use strict';
-const HZ_VERSION = '5.4.0-SNAPSHOT';
-const HZ_TEST_VERSION = '5.4.0-SNAPSHOT';
+const HZ_VERSION = '5.4.0';
+const HZ_TEST_VERSION = '5.4.0';
 const HAZELCAST_TEST_VERSION = HZ_TEST_VERSION;
 const HAZELCAST_VERSION = HZ_VERSION;
 const HAZELCAST_ENTERPRISE_VERSION = HZ_VERSION;