s2n v1.7.9

An implementation of the TLS/SSL protocols

Release notes

## Release Summary
* Add `s2n_conn_get_signature_public_key_type()` API which returns a string describing the leaf certificate's public key type and parameters for a completed TLS connection.

## What's Changed
* feat: add backwards compatible hybrid PQ policies by @CarolYeh910 in https://github.com/aws/s2n-tls/pull/6044
* docs: io callback examples by @jmayclin in https://github.com/aws/s2n-tls/pull/6036
* fix(bindings): avoid mutable aliasing in shared Config callbacks by @jouho in https://github.com/aws/s2n-tls/pull/6053
* fix: set actual_protocol_version_established on deserialized connections by @jouho in https://github.com/aws/s2n-tls/pull/6049
* chore: upgrade CBMC to 6.11.0 by @WesleyRosenblum in https://github.com/aws/s2n-tls/pull/6061
* perf(sidetrail): Avoid digest zeroing in proof by @alexw91 in https://github.com/aws/s2n-tls/pull/6056
* chore(bindings): release bump v0.3.43 by @jouho in https://github.com/aws/s2n-tls/pull/6070
* feat: add `s2n_conn_get_signature_public_key_type` API by @CarolYeh910 in https://github.com/aws/s2n-tls/pull/5963
* feat(metrics): add negotiated metrics for compatibility by @jmayclin in https://github.com/aws/s2n-tls/pull/6068
* feat: skip blinding delay on missing required client cert by @jouho in https://github.com/aws/s2n-tls/pull/6072
* fix: restrict cert signature preferences in custom CNSA2 interop policies by @CarolYeh910 in https://github.com/aws/s2n-tls/pull/6073
* fix(metrics): normalize s2n signature by @jmayclin in https://github.com/aws/s2n-tls/pull/6077

**Full Changelog**: https://github.com/aws/s2n-tls/compare/v1.7.8...v1.7.9

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