Fix: Handle leap year calculation for valid dates in February
--HG-- branch : 16.0
- Fix ci error :
ValueError: day is out of range for month
- Odoo task :
MO16-00745 - Date non valide pour année non bissextile tests account_period
--HG-- branch : 16.0
ValueError: day is out of range for month
MO16-00745 - Date non valide pour année non bissextile tests account_period