chore(deps): update module github.com/refraction-networking/utls to v1.6.7

This MR contains the following updates:

Package	Type	Update	Change
github.com/refraction-networking/utls	require	patch	v1.6.6 -> v1.6.7

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Release Notes

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

v1.6.7: Allow inspecting Client Hello before locking Session/PSK

Compare Source

What's Changed

• Allow BuildHandshakeState to inspect ClientHello before setting SessionTicket/PSK by @​adotkhan in https://github.com/refraction-networking/utls/pull/301

Full Changelog: https://github.com/refraction-networking/utls/compare/v1.6.6...v1.6.7

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