Update dependency net.axay:kspigot to v1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
net.axay:kspigot	1.19.2 → 1.21.0

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Release Notes

jakobkmar/KSpigot (net.axay:kspigot)

v1.21.0

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• recompiled for Minecraft 1.21.0
• fix unregistering the wrong GUI on InventoryCloseEvent #​69 by @​xNoobyyy

v1.20.4

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• updated to Minecraft 1.20.6

v1.20.3

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• updated to Minecraft 1.20.4 by @​mgvpri

v1.20.2

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• updated to Minecraft 1.20.2 by @​DarkVanityOfLight
• now using Kotlin 1.9.21 and up-to-date kotlinx dependencies

v1.20.1

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• updated to Minecraft 1.20.1 by @​Command435-CRM
• now using Kotlin 1.8.22 and up-to-date kotlinx dependencies

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