Port the server to 26.1 (when it releases)

Things that need to be updated to 26.1 before we can:

• Minecraft itself
• Paper
• PacketEvents
• VulcanAntiCheat
• ApolloBukkit (likely forwards-compatible)
• Invsee++ (if needed switch to https://github.com/Jikoo/OpenInv/ )
• LuckPerms
• Protocollib
• SuperVanish (likely forwards-compatible)
• TAB-Bridge (likely forwards-compatible)
• ViaVersion
• WorldEdit