Set required node version as .nvmrc's version (#2279)

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## Related Issue

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- None

## Summary

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- #2260 에서 chromatic에서
사용하는 노드 버전이 engine.node 와 달라져서 에러가 뜬 이슈가 있었습니다
([#](https://github.com/channel-io/bezier-react/actions/runs/9343590910/job/25713414442)).
그 때는 크로마틱 버그로 인식을 못해서 package.json.engine.node 버전을 18.20.3 에서
>=18.20.3으로 바꿔서 해결했는데, 크로마틱의 최신 버전에서 이 이슈가 해결되어서 .nvmrc 버전과 동일한 버전으로
돌립니다.

## Details

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- None

### Breaking change? (Yes/No)

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- No

## References

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-
https://github.com/chromaui/chromatic-cli/blob/HEAD/CHANGELOG.md#v1154-wed-jun-12-2024
(PR1006이 수정PR)

package.json

@@ -45,7 +45,7 @@
  "typescript": "^5.4.2"
  },
  "engines": {
- "node": ">= 18.20.3",
+ "node": "18.20.3",
  "yarn": "4.2.2"
  },
  "config": {