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update rustls dependency and make edits to support its api changes
The rustls crate made some significant changes to its api in v0.23.0, as summarized in the release notes. This pull request bumps the versions of the rustls, rustls-pemfile, and webpki-roots crates, and makes a number of changes needed in response to the aforementioned api changes.
There is, unfortunately, an important drawback to consider. The v0.23.0 release introduced process-wide selection of crypto providers, which requires either that A) we make a breaking api change that requires users to pass in a CryptoProvider when creating a ClientConnection or that B) the user calls CryptoProvider::install_default() exactly once. This pull request does not implement option A, nor does it include the documentation necessary for users to make option B work. I'm interested in adding the documentation for B and maybe trying to figure out some way of putting A behind a feature gate if desired, but I wanted to get feedback first.
Realizing now that this is very similar to the changes made in this branch, which is a couple months behind main
