fix: use mem::swap on cloned inner service#561
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In the `AsyncRequireAuthorization` service, the cloned service could be different than the ready service due to the complexities described here: https://docs.rs/tower/latest/tower/trait.Service.html#be-careful-when-cloning-inner-services so this commit fixes it by using std::mem::replace as recommended in the documentation
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Motivation
Without this change the inner service may
panic!since the cloned service may not be the ready service as described inthe tower docs
Solution
Use
std::mem::replaceto swap the ready and cloned services