Is your refactoring request related to a problem? Please describe.

To be able to upgrade to the latest version of rustls, which is 0.23 at the time of writing, we need to upgrade its dependent hyper-rustls, which in turns requires upgrading its dependent hyper.

We added hyper@0.14, but it's had a major update since and currently sits at 1.5.2. As such there were some breaking changes in the API, but I wouldn't expect migrating to be particularly difficult. A migration guide is available.

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Additional context

As part of HSM work, it is necessary to upgrade rustls to at least 0.22. However because some dependencies like axum-server don't support 0.22 and upgrade straight to 0.23, we need to either keep two versions of rustls and split certificate crate around these two versions (#3359) or we can use a yet unreleased version of rumqttc which supports rustls@0.23 and do necessary upgrades for other crates. I view the 2nd solution as preferable as we'll probably have to upgrade these dependencies anyway in the future.