0.23.21

Added support for sending the certificate_authorities extension in the ClientHello (see #2265).

What's Changed

• improve provider-example CI testing & coverage testing by @brodycj in #2277
• Adopt benchmarking docs to new rustls-bench crate by @sbernauer in #2279
• Support certificate_authorities extension in ClientHello by @s-arash in #2265
• Clarify ordering of module items by @djc in #2271
• examples: ech-client should process all HTTPS records by @cpu in #2278
• docs: fix CONTRIBUTING.md broken link by @cpu in #2282
• Improve fuzzing coverage further by @ctz in #2267
• post-quantum key exchange writeup by @ctz in #2281
• Take aws-lc-rs 1.12 by @ctz in #2286
• Server fuzzing harness improvements by @ctz in #2294
• cleanup: use more parens when calculating ECH seed by @brodycj in #2296
• docs: update @cpu maintainer status by @cpu in #2299
• Prepare v0.23.21 release by @s-arash in #2301