Update theme - IMSA month

[Pooya995016]

Hello @Poporoth .
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Update theme - 24h month

Hello everyone! 24h month will be all about endurance racing! Note to developers: Hello to all developers at T10! If you decided to make this update, please ensure that it’ll be ready by the end of June 2026. Thank you for reading. New cars: Porsche 919 LMP1 (2015) Peugeot 908 Audi R8C Cadillac Northstar LMP Ferrari 499P LMH (2023) Peugeot 9x8 LMH (2024) Alpine A424 LMDh (2024) Aston Martin Valkyrie LMH (2025) Aston Martin Vantage GT3 (2024) Mercedes AMG GT3 (2024) Lamborghini…