chore(deps): update module github.com/refraction-networking/utls to v1.6.4

This MR contains the following updates:

Package	Type	Update	Change
github.com/refraction-networking/utls	require	patch	v1.6.3 -> 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

Compare Source

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: https://github.com/refraction-networking/utls/compare/v1.6.3...v1.6.4

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