fix: pollingInterval update logic in useRequest-usePolling

[xiaoYuanDun]

[中文版模板 / Chinese template]

🤔 This is a ...

• [ ] New feature
• [ ] Bug fix
• [ ] Site / documentation update
• [ ] Demo update
• [ ] TypeScript definition update
• [ ] Bundle size optimization
• [ ] Performance optimization
• [ ] Enhancement feature
• [ ] Internationalization
• [ ] Refactoring
• [ ] Code style optimization
• [ ] Test Case
• [ ] Branch merge
• [x] Other (Improve pollingInterval's update logic)

🔗 Related issue link

fix: https://github.com/alibaba/hooks/issues/1457

💡 Background and solution

📝 Changelog

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🇨🇳 Chinese

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