Fix reading tokens.txt on Windows. (#1497) #1443

Job	Run time
ubuntu-20.04 3.10 transducer	7m 11s
ubuntu-20.04 3.10 paraformer	8m 23s
ubuntu-20.04 3.10 zipformer2-ctc	7m 12s
ubuntu-22.04 3.10 transducer	4m 17s
ubuntu-22.04 3.10 paraformer	6m 22s
ubuntu-22.04 3.10 zipformer2-ctc	4m 50s
windows-latest 3.10 transducer	17m 34s
windows-latest 3.10 paraformer	20m 35s
windows-latest 3.10 zipformer2-ctc	13m 7s
macos-latest 3.10 transducer	4m 14s
macos-latest 3.10 paraformer	4m 30s
macos-latest 3.10 zipformer2-ctc	3m 52s
macos-14 3.10 transducer	5m 12s
macos-14 3.10 paraformer	6m 43s
macos-14 3.10 zipformer2-ctc	5m 7s
	1h 59m 9s

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