why dayjs('2024-12-31').locale('zh-cn').week() return 1 not 53

**Describe the bug**
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**Expected behavior**
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**Information**
- "dayjs": "^1.11.13",
- OS: mac
- Browser [e.g. chrome 62]
- Time zone: zh-cn

Reproduce the reported expression with Day.js 1.11.13 and the zh-cn locale, then inspect the locale and week-number behavior involved. Done means the issue's expected week number is established and the implementation or documentation consistently reflects the applicable locale rules.

Written by the indexing model from the issue text.