llama : bump max layers from 512 to 1024

[nicoboss]

This fixes #9909

This increases LLAMA_MAX_LAYERS from 512 to 1024 making it possible for llama.cpp to load models with more than 512 layers.
I further incremented LLAMA_SESSION_VERSION as it was done back when LLAMA_MAX_LAYERS got increased to 512 in #8530

Thanks to this change I was able to run FatLlama-1.7T-Instruct which prior to this change caused llama.cpp to crash.

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