chore: release v4.0.0

[github-actions]

🤖 New release

• ktls: 3.0.2 -> 4.0.0 (⚠️ API breaking changes)

⚠️ ktls breaking changes

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.23.0/src/lints/inherent_method_missing.ron

Failed in:
  KtlsStream::drained_remaining, previously in file /tmp/.tmptZaBlE/ktls/src/ktls_stream.rs:55

Changelog

4.0.0 - 2023-10-08

Fixed

• [breaking] Remove drained_remaining public method

Other

• Add more test coverage
• Remove more explicit libc::close calls
• Clarifies what this.inner.poll_shutdown does
• Improve integration tests: try reading/writing after close, catch errors from both sides
• Don't forget to close fd on writer side
• Simplify/clarify code around alerts
• Use enums to 'parse' TLS alerts
• Depend on ktls-recvmsg v0.1.3
• Remove panic, ktls may send unfinished alert msg
• assert instead of asser_eq
• Adding edge case in integration test for session shutdown
• Properly handle critical alerts
• Add crates.io badge
• Use Rust stable for tests

---

This PR was generated with release-plz.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (a0fb5ba) 86.15% compared to head (228675b) 86.15%.

❗ Current head 228675b differs from pull request most recent head 3ca7791. Consider uploading reports for the commit 3ca7791 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #35   +/-   ##
=======================================
  Coverage   86.15%   86.15%           
=======================================
  Files           5        5           
  Lines         585      585           
=======================================
  Hits          504      504           
  Misses         81       81           

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