feat(s2n-quic-rustls): update rustls from 0.21 to 0.23

[toidiu]

This PR reverts the revert PR to upgrade rustls:

• Original PR: (feat(s2n-quic-rustls): update rustls from 0.21 to 0.23 #2143)
• Revert PR: (Revert "feat(s2n-quic-rustls): update rustls from 0.21 to 0.23 (#2143)" #2174)

Description of changes:

One noteworthy change: rustls now has a concept of crypto providers (ring or aws-lc-rs) and by default uses aws-lc-rs. For this reason I choose to use aws-lc-rs also, which is a change in behavior since previously we used ring. In the future we could expose the option for s2n-quic customers to choose their own crypto provider.

Call-outs:

I removed some deprecated exports because either:

• they no longer exist (::rustls::{Certificate, PrivateKey})
• they are not useful (pub static DEFAULT_CIPHERSUITES: &[rustls::SupportedCipherSuite])

Testing:

Existing unit tests and examples pass.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[thynson]

Since shipping this should be a breaking change, I think it can go a bit further that we should respect the CryptoProvider::get_default(), since it relying on the end user to do the initialization work, i.e. aws_lc_rs::default_provider().install_default(), which will be another breaking change.