Elementals 1.48.6 - GeckoLib Forge 4.8.4 Connector compatibility multiplayer NBT fix

Built for:
- elementals-1.48.6.jar
- geckolib-forge-1.20.1-4.8.4.jar
- Connector-1.0.0-beta.48+1.20.1.jar
- ConnectorExtras-1.11.2+1.20.1.jar

Keeps previous GeckoLib fix:
- MetalArmorItem and GliderItem no longer call the missing GeoItem.makeRenderer(GeoItem).

New multiplayer fix:
- Patched dev.saperate.elementals.network.packets.GetUpgradeListC2SPacket
- Patched dev.saperate.elementals.packets.SyncUpgradeListS2CPacket
- Server now sends an empty CompoundTag instead of null upgrade NBT.
- Client now ignores/repairs null upgrade NBT instead of disconnecting.
- Exceptions during upgrade-list sync are swallowed so a bad player upgrade state cannot kick the player.

Install:
- Use this jar on both server and all clients.
- Remove older Elementals compat jars and any elementals_geckolib_bridge jars.
