- Upgrade PacketEvents from 2.9.1 to 2.9.3 for 1.21.8 compatibility
- Add V1_21_8PacketFactory with full protocol support
- Update version support range in README.md to include 1.21.8
- Update test configuration to use Minecraft 1.21.8
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Co-Authored-By: Claude <noreply@anthropic.com>