fix: msg_stamp.size() is unsigned,should convert to int (#2523)

TouchZZZ

2025-05-22 eccf74684743593950ad259877db7ce9ffc06e93

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from fun_text_processing.text_normalization.en.taggers.tokenize_and_classify import ClassifyFst
from fun_text_processing.text_normalization.en.verbalizers.verbalize import VerbalizeFst
from fun_text_processing.text_normalization.en.verbalizers.verbalize_final import VerbalizeFinalFst