Add 1.21.8 support

[Baktus79]

• Updated dependencies.

[Baktus79]

Latest commit fixes the error;

java.lang.IllegalArgumentException: Invalid slot index 9 for Crafter
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:191) ~[guava-33.3.1-jre.jar:?]
        at org.bukkit.craftbukkit.block.CraftCrafter.isSlotDisabled(CraftCrafter.java:57) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at JEXT-Reborn.jar/me.spartacus04.jext.listeners.DiscUpdateEvent.updateInventory(DiscUpdateEvent.kt:39) ~[JEXT-Reborn.jar:?]
        at JEXT-Reborn.jar/me.spartacus04.jext.listeners.DiscUpdateEvent.inventoryOpenEvent(DiscUpdateEvent.kt:24) ~[JEXT-Reborn.jar:?]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:71) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-api-1.21.8-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.event.CraftEventFactory.callInventoryOpenEventWithTitle(CraftEventFactory.java:1292) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.level.ServerPlayer.openMenu(ServerPlayer.java:1718) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.world.level.block.CrafterBlock.useWithoutItem(CrafterBlock.java:140) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.world.level.block.state.BlockBehaviour$BlockStateBase.useWithoutItem(BlockBehaviour.java:904) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.level.ServerPlayerGameMode.useItemOn(ServerPlayerGameMode.java:514) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.handleUseItemOn(ServerGamePacketListenerImpl.java:2048) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.network.protocol.game.ServerboundUseItemOnPacket.handle(ServerboundUseItemOnPacket.java:45) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.network.protocol.game.ServerboundUseItemOnPacket.handle(ServerboundUseItemOnPacket.java:10) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:29) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:155) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1449) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:176) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:129) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1429) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1423) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:139) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:1380) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1388) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1265) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.8.jar:1.21.8-42-b0da38c]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

[Baktus79]

I found that when JEXT is active, disabled slots in the Crafter block are not remembered.
Steps to reproduce:

1. Open a Crafter.
2. Disable some slots.
3. Close the GUI.
4. Re-open the Crafter → all slots are active again.

This happens because updateInventory overwrote the entire inv.contents array, which resets the Crafter’s internal disabled slot state.

This PR fixes the issue by:

• Taking a snapshot of the disabled slots before updating.
• Updating items slot-by-slot instead of replacing the whole contents array.
• Restoring the exact disabled state afterwards.

With this change, disabled slots in the Crafter persist correctly when reopening the GUI.