America/Indiana/Indianapolis timezone does not display correctly

## What happens For `America/Indiana/Indianapolis`, `get_timezone_name` returns `GMT-05:00`/`GMT-04:00` ### Expected For `America/Indiana/Indianapolis`, `get_timezone_name` should return `Eastern Standard Time`/`Eastern Daylight Time` This broke after upgrading babel to `2.18.0`. It works as expected on `2.17.0`. From my finding there is no key in Locale's timezones Test script ```python from datetime import datetime import zoneinfo from babel import dates iana_id = "America/Indiana/Indianapolis" target_date = datetime(2025, 7, 1, 12, 0, 0) # July 1st, 2025 localized_dt = target_date.replace(tzinfo=zoneinfo.ZoneInfo(iana_id)) full_name = dates.get_timezone_name(localized_dt, locale='en_US', width='long') print(f"Specific Name: {full_name}") ```