Holidata

- Upgrade test requirements pytest to 8.3.5 and syrupy to 4.9.0
- 119 DK: Holiday "Store bededag" was abolished in 2023

- DE: Document legal sources for region 'TH' (Thüringen)
- DE: Add holiday "Fronleichnam" in region 'TH' for communities with catholic majority
- 117 DE: Add holiday "Weltkindertag" in region 'TH' (Thüringen)
(thanks to Slarky)
- Add support for Python 3.13, drop Python 3.8

- 115 US: Implement federal holidays
(thanks to J. David Stark)

- hu-HU: Add non-working days for 2025 in Hungary

- es-ES: Implement 2025 holidays of Spain

- 112 Add locale en-AU
(thanks to Alex Smith)