chore(deps): bump rustls from 0.21.7 to 0.21.9

[dependabot[bot]]

Bumps rustls from 0.21.7 to 0.21.9.

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

0.21.8

• Fixes ConnectionCommon::complete_io() to flush writers before potentially expecting a response.
• Upgrades *ring* to 0.17 - Note: *ring* 0.17 when built with gcc will experience slower X25519 and Ed25519 operations compared to previous releases.
• Upgrades rustls-webpki to 0.101.7 to match *ring* 0.17 dependency
• Tls12CipherSuite::hash_algorithm() and Tls13CipherSuite::hash_algorithm() are now crate-internal. This is a small breaking change to remove unintended exposure of underlying *ring* types in the public API.

What's Changed

• fuzz: remove unused webpki dependency by @​ctz in rustls/rustls#1523
• Fix nightly clippy warning by @​djc in rustls/rustls#1443
• Upgrade to ring 0.17 by @​djc in rustls/rustls#1508
• Bump MSRV to 1.61 by @​djc in rustls/rustls#1516
• docs: adjust ring platform compatibility by @​cpu in rustls/rustls#1532
• Fix: flush writers before potentially expecting a response by @​robsdedude in rustls/rustls#1542
• v0.21.8 preparation by @​cpu in rustls/rustls#1525

Full Changelog: https://github.com/rustls/rustls/compare/v/0.21.7...v/0.21.8

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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[mbrubeck]

Still holding off on this until a new release of rcgen to avoid building two versions of ring.

[dependabot[bot]]

Superseded by #307.