feat: add Minecraft 26.3 support - #836

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

[deprecation] parseMaterial() in XMaterial has been deprecated

[deprecation] parseMaterial() in XMaterial has been deprecated

[deprecation] getOfflinePlayer(String) in Bukkit has been deprecated

[rawtypes] found raw type: CommandManager

[deprecation] getMaxHealth() in Damageable has been deprecated

[rawtypes] found raw type: CommandManager

[deprecation] scheduleAsyncRepeatingTask(Plugin,Runnable,long,long) in BukkitScheduler has been deprecated

[deprecation] getLine(int) in Sign has been deprecated

[deprecation] getLine(int) in Sign has been deprecated

[deprecation] getLine(int) in Sign has been deprecated