feat(https): TLS 1.3 support under native-tls 🎉

[AverageHelper]

Updates native-tls backend to a version with TLS 1.3 support, and updates min/max TLS version logic and related docs to match.

Fixes #2974
Addresses #2931

[AverageHelper]

Not sure if there are unit tests around this that need updating, but I tested this in a local crate and it seems to do the trick

[AverageHelper]

hmm, looks like this might actually require an MSRV bump too :/

[seanmonstar]

Aw bummer. I wish there was a way for us to conditionally that we could use the newer version without restricting using the older compiler.

[AverageHelper]

agreed, tho idk how it would work 😓 As far as I can tell, the requirement in this case is with several transient dependencies, including openssl-sys and others that might be Hard™ to work around.

not sure how you wanna handle Semver with this, or if bumping msrv is a deal-breaker for this fix.

[lms0806]

The minimum version of rust-native-tls that supports Tlsv13 is 0.2.16, and the rust-version for that version is 1.80.0.

To use Tlsv13 with rust-native-tls, it seems best to upgrade the rust-version to 1.80.0.

[AverageHelper]

hmm, guess the CI needs approval or something to do a re-check against 1.80

[AverageHelper]

Actually, cargo-msrv tells me that 1.83.0 is in fact the lowest supported, due to transient icu_* deps reporting that as their MSRV. But if someone with CI access wants to edit my PR to find the lowest version that'll pass the CI's own checks (since I can't re-approve CI every time I try a different one, and idk about installing a different version of the toolchain manually like the CI seems to) that'd be kinda awesome 😅

A large MSRV is undesirable