Describe the bug
Whit Monday was removed from holiday list of Italian subdivision "BZ" in this commit. This change seems accidental as commit message doesn't indicate any desire to change this.
References to Italian holiday rulings still consider Whit Monday to be an official holiday in "BZ" region (see ref).

To Reproduce

Before commit

import holidays
holidays.country_holiday("IT", subdiv="BZ", years=2025) #contains "Lunedi de Penecoste"

After commit

import holidays
holidays.country_holiday("IT", subdiv="BZ", years=2025) #does not contain "Lunedi de Penecoste"

Expected behavior
Whit Monday (dynamic per year) is a full holiday for tuple (IT, subdiv=BZ).

Screenshots

Environment

• OS: Ubuntu 20.04
• Python version: 3.11
• holidays version: 0.89

Additional context
Add any other context about the problem here.