fix: correct the drawing-game Socket.IO version labels to 4.8.4

[Revan0809]

Summary

The drawing-game example's dependencies are pinned to socket.io/socket.io-client 4.8.4, but the observation output and README still said 4.8.3.

• examples/drawing-game/observe.ts: the targets key is now socket.io@4.8.4.
• examples/drawing-game/README.md: both version mentions in the "Run with Real Socket.IO" section updated to 4.8.4.

Fixes #521

Test plan

• Built the workspace (pnpm build at the root, pnpm --filter smocket-client build) and ran pnpm observe in examples/drawing-game — output now reports "socket.io@4.8.4" and "deeplyEqual": true
• Confirmed no remaining 4.8.3 references anywhere under examples/drawing-game/

🤖 Generated with Claude Code

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1 Skipped Deployment

Project	Deployment	Actions	Updated
smocket	Skipped		Oct 1, 2026 12:55pm UTC

[electrohyun]

Thank you for the contribution!