Update rustls requirement from 0.21.6 to 0.22.0

[dependabot[bot]]

Updates the requirements on rustls to permit the latest version.

Release notes

Sourced from rustls's releases.

0.21.9

• Fixes using the (non-default) read_buf feature with Rust nightly newer than nightly-2023-11-01 by opting in to the core_io_borrowed_buf feature and updated BorrowedBuf, BorrowedCursor types.

What's Changed

• Fix build: new feature needed for std::io::BorrowedBuf et al. by @​ctz in rustls/rustls#1582
• v0.21.9 preparation by @​cpu in rustls/rustls#1592

Full Changelog: https://github.com/rustls/rustls/compare/v/0.21.8...v/0.21.9

Commits

• bbd9abc Cargo: v0.21.8 -> v0.21.9
• 5edc126 Use BorrowedCursor & BorrowedBuf from core::io
• 7abd73f Opt in to feature(core_io_borrowed_buf)
• c34477a Cargo: 0.21.7 -> 0.21.8
• 8cf2594 sign: fix clippy get-first warning
• ecc6cde Flush writers before potentially expecting a response
• 53adb9d docs: adjust ring platform compatibility
• d5d6249 upgrade to ring 0.17
• a659652 tls12/tls13: make hash_algorithm crate internal
• 3ed39ad upgrade to webpki 0.101.7
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #30.