Update holiday_cn_zh-cn, replenish all holidays from 2004 to 2024.

The list of Chinese holidays has not been updated since 2009, and this commit fills in the historical records of working days and holidays from 2004 to 2024.

Reason for the complete holiday list:

Due to the fact that the holidays are arranged at the discretion of the State Council based on the Chinese lunar calendar every year, and there is no general rule, it is necessary to manually enumerate all holidays.

Reason for deleting the original 2009 holidays:

Lover's Day&Dragon Boat Festival&Double Ninth Day&Ghost Festival do not result in days off in China.