PHP FIG SimpleCache 2021 updates

[llegaz]

Hello,

the tests does not work anymore with breaking changes made on Psr/simple-cache

2.0.x-dev

3.0.x-dev

I may try to propose a PR if you want.

[stof]

@llegaz can you open such PR ?

[llegaz]

I think yes, I will give a try at least give me a few days