chore(deps): update module github.com/refraction-networking/utls to v1.6.6

This MR contains the following updates:

Package	Type	Update	Change
github.com/refraction-networking/utls	require	patch	v1.6.4 -> v1.6.6

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Release Notes

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

v1.6.6: Hotfix: QUIC must not send non-empty session ID by RFC

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What's Changed

• quic: always use empty session ID by @​gaukas in https://github.com/refraction-networking/utls/pull/297

Full Changelog: https://github.com/refraction-networking/utls/compare/v1.6.5...v1.6.6

v1.6.5: Popular Firefox 120 parrot and deps update

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What's Changed

• build(deps): bump golang.org/x/net from 0.20.0 to 0.23.0 by @​dependabot in https://github.com/refraction-networking/utls/pull/293
• Update Firefox 120 parrot to a more popular version by @​adotkhan in https://github.com/refraction-networking/utls/pull/296

New Contributors

• @​adotkhan made their first contribution in https://github.com/refraction-networking/utls/pull/296

Full Changelog: https://github.com/refraction-networking/utls/compare/v1.6.4...v1.6.5

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