Upgrade dependencies: go-redis and ccache

[Gordon]

Hi @Pacific73
Would you like to upgrade some dependencies to latest version, they are a bit old. Thank you.

go-redis: v6-->v8
ccache: v2-->v3

[KTexas73]

For some compatibility issue, we tend not to upgrade the version. If you really need this feature, you can fork and modify the code. Thx

[杨成锴]

I'm curious to see if the new lib version will provide a performance boost.