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

[wufangyong973]

#521

The example pins socket.io and socket.io-client to 4.8.4 in its package.json, but the observation target key in examples/drawing-game/observe.ts and both version strings in the README's "Run with Real Socket.IO" section still said 4.8.3. Corrected the three version strings to 4.8.4.

No logic change; the output should now report socket.io@4.8.4 and keep deeplyEqual: true.

Closes #521.

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[electrohyun]

Thank you for the contribution! The changes address the issue as intended.

But, I'd like to keep the remaining good first issues available for other new contributors, so I'll close this PR. I'm happy to merge #534 once you've addressed the review feedback and the required checks pass.