Update module github.com/refraction-networking/utls to v1.6.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/refraction-networking/utls	v1.6.2 -> v1.6.4

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Release Notes

refraction-networking/utls (github.com/refraction-networking/utls)

v1.6.4: bugfix: UConn incorrectly inherits Conn methods

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What's Changed

• build(deps): bump github.com/quic-go/quic-go from 0.40.1 to 0.42.0 by @​dependabot in https://github.com/refraction-networking/utls/pull/289
• fix: (*UConn).Read() and Secure Renegotiation by @​gaukas in https://github.com/refraction-networking/utls/pull/292

Full Changelog: refraction-networking/utls@v1.6.3...v1.6.4

v1.6.3: Cryptographically Secured Shuffle

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Don't panic! This does not cause any significant security concern, since modern platforms are doing fine with limited randomness from math/rand. This patch is for some much restrictive platforms such as WebAssembly -- on which math/rand may generate deterministic output (e.g., same random number series from each cold start).

What's Changed

• security: crypto/rand ShuffleChromeTLSExtensions by @​gaukas in https://github.com/refraction-networking/utls/pull/286

Full Changelog: refraction-networking/utls@v1.6.2...v1.6.3

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.55%. Comparing base (c48a880) to head (e483183).
Report is 2 commits behind head on master.

❗ Current head e483183 differs from pull request most recent head 1cc4a1f. Consider uploading reports for the commit 1cc4a1f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #251      +/-   ##
==========================================
- Coverage   67.04%   63.55%   -3.49%     
==========================================
  Files          35       37       +2     
  Lines        2224     2346     +122     
==========================================
  Hits         1491     1491              
- Misses        565      687     +122     
  Partials      168      168              

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