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xemu v0.8.134 Adopts SDL3, Improves APU Throttling and nv2a Vulkan Backend

The xemu project recently released version 0.8.134 of their original Xbox emulator. This update notably migrates the project to SDL3, bumping the dependency to SDL 3.4.2. The transition to SDL3 was handled by multiple contributions, including a dedicated migration pull request. Further enhancements in this release focus on the Audio Processing Unit (APU). Improvements to APU throttling have been implemented, alongside restructuring the monitor sink to remove callbacks and extra buffers, and using SDL_SetAudioStreamGain for volume control. For graphics, the nv2a Vulkan backend received cleanup for instance creation. The update also includes various internal cleanups and continuous integration fixes.

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