Count the number of weekdays (Monday through Friday) in a given month and year. A weekday is any day from Monday to Friday, excluding weekends (Saturday and Sunday).
Examples:
Input: year = 2025, month = 1
Output: 23
Explanation: January 2025 has 23 weekdays
Input: year = 2025, month = 2
Output: 20
Explanation: February 2025 has 20 weekdays
Input: year = 2024, month = 12
Output: 22
Explanation: December 2024 has 22 weekdays
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