chore!: sync with upstream Minestom dd2ddbc

[oglassdev]

Upstream Minestom gained six commits since the last sync (5485bbd). This brings multistom up to Minestom/Minestom@dd2ddbc72d so we don't drift.

What comes in

• Connection factory (feat: implement connection factory Minestom/Minestom#3409): Server.setConnectionFactory() lets users supply their own PlayerSocketConnection subclass, or return null to reject a client.
• CachedPacket (refactor: cache CachedPacket packets separately from framed bodies Minestom/Minestom#3412): the packet is cached separately from its framed body, so asking for the packet no longer frames it.
• setInstance (fix: cancel a pending setInstance when a later call replaces it Minestom/Minestom#3411): a setInstance still waiting on chunks completes with CancellationException when a later call replaces it, instead of moving the player back afterwards.
• SmithingTrim uses a Holder<TrimPattern> (fix: update SmithingTrim to use Holder for trimPattern Minestom/Minestom#3407), ArgumentResourceLocation is renamed to ArgumentKey (refactor: Rename ArgumentResourceLocation to ArgumentKey Minestom/Minestom#3316), and .gitattributes is added (chore: add .gitattributes Minestom/Minestom#3410).

Where multistom differs from upstream

• Server: the factory keeps upstream's signature, so code written against upstream compiles unchanged. Each Server defaults to a factory bound to its own ServerProcess, and a connection that belongs to another process is refused and its channel closed. A null rejection happens before the connection is tracked.
• CachedPacket: upstream's split is ported onto the PacketEncodingContext-keyed cache. One framed representation is still kept for the most recent context, but a different context now reuses the supplied packet instead of invoking the supplier again.
• Tests: upstream's two new CachedPacket tests are ported into SendablePacketTest (multistom has no SendablePacketIntegrationTest). ProcessConnectionTest gains a test for the factory: a custom factory is used, null rejects the client, and a foreign-process connection is refused.

Breaking changes

• ArgumentResourceLocation → ArgumentKey, ArgumentType.ResourceLocation() → ArgumentType.Key(), parser id "resourcelocation" → "key".
• SlotDisplay.SmithingTrim.trimPattern is a Holder<TrimPattern> instead of a SlotDisplay.

Checks

Compiled core and demo, and ran SendablePacketTest, PlayerIntegrationTest, ArgumentTypeTest, ArgumentParserTest, ProcessConnectionTest, ProcessPacketOwnershipTest and NetworkPropertiesTest. The full suite was left to CI.

Merge with a merge commit so upstream's history stays an ancestor for the next sync.

🤖 Generated with Claude Code

[github-actions]

Binary Compatibility

This Pull Request has introduced binary incompatible changes compared to the master branch.

What is Binary Compatibility?
Binary compatibility ensures that libraries compiled against Minestom can upgrade between versions without needing recompilation.

What should you do?

• If unintentional, please restore the compatibility. Feel free to ask for help if you are unsure how to proceed.
• If intentional, a maintainer will review them and label your PR as breaking, which will bypass this check. Please refer to CONTRIBUTING.md for requirements regarding breaking changes.

View offending signatures

Public/protected method removed or signature changed: net/minestom/server/command/builder/arguments/ArgumentType#ResourceLocation(Ljava/lang/String;)Lnet/minestom/server/command/builder/arguments/minecraft/ArgumentResourceLocation;
Class removed, made package-private or considered internal: net/minestom/server/command/builder/arguments/minecraft/ArgumentResourceLocation
Public/protected method removed or signature changed: net/minestom/server/recipe/display/SlotDisplay$SmithingTrim#<init>(Lnet/minestom/server/recipe/display/SlotDisplay;Lnet/minestom/server/recipe/display/SlotDisplay;Lnet/minestom/server/recipe/display/SlotDisplay;)V
Public/protected method removed or signature changed: net/minestom/server/recipe/display/SlotDisplay$SmithingTrim#trimPattern()Lnet/minestom/server/recipe/display/SlotDisplay;