chore: ⬆️ Update NVIDIA/NeMo-Speech.cpp to 9bc876635af36df537d9bc6d3f57ad1b76e4f74a - #11417

@localai-org-maint-bot pick this up

Picked this up. The NeMo-Speech.cpp bump made SentencePiece a core ASR dependency, so I added the pinned static archive build for all backend variants, including the Darwin CMake search path. The automation regenerated the branch again at 5ecc7e04c and dropped the fix; I restored the same patch onto the new head as 6ceec62e6. Validation: git diff --check and make -n -C backend/go/nemo-speech-cpp build with both WITH_NORM=ON and WITH_NORM=OFF. DCO still needs human handling; I have not modified or added any human attestation.

Restored the SentencePiece build fix after automation regenerated the branch at d87d5d620 and dropped it. The branch now points to c015defc4 on current master. git diff --check passes, and dry-run backend builds resolve successfully with both WITH_NORM=ON and WITH_NORM=OFF. The pushed run will validate the full backend build. The bot-assisted commit intentionally contains no human DCO attestation.