Use SET command instead of SETEX

[ehsanalemzadeh]

In DefaultValueOperations, the set method with timeout argument calls the setEx command internally. However, SETEX command was deprecated in version 2.6.12 of Redis. According to Redis documentation, it is recommended to replace SETEX with SET using the EX argument. Redis documentation

[mp911de]

Good catch. Do you want to submit a pull request?

[ehsanalemzadeh]

Sure. I will do it soon.