Hotwords file needs to specify default utf-8 encoding. (#2379)

辰冢

2025-02-12 5052ca8bf03c178d9ae73cb68785cd4afb0144d2

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ID0012W0013 https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/test_audio/asr_example_zh.wav
ID0012W0014 https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/test_audio/asr_example_en.wav