Version区切り文字を公式Caskと同じように`@`にする #66

Job	Run time
generate-matrix	25s
syntax (macos-13)	54s
test voicevox (macos-13, intel)	4m 57s
test voicevox (macos-14, arm)	2m 35s
test voicevox@dev (macos-13, intel)	5m 33s
test voicevox@dev (macos-14, arm)	2m 39s
test voicevox@preview (macos-13, intel)	3m 36s
test voicevox@preview (macos-14, arm)	2m 39s
conclusion	1s
	23m 19s

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