chore(deps): update module github.com/xtaci/kcp-go/v5 to v5.6.18

This MR contains the following updates:

Package	Type	Update	Change
github.com/xtaci/kcp-go/v5	require	patch	v5.6.8 -> v5.6.18

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Release Notes

xtaci/kcp-go (github.com/xtaci/kcp-go/v5)

v5.6.18

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v5.6.17

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v5.6.16

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v5.6.15

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v5.6.14

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v5.6.13

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v5.6.12

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Full Changelog: https://github.com/xtaci/kcp-go/compare/v5.6.11...v5.6.12

v5.6.11

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v5.6.10

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v5.6.9

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