`OpenJtalk`を`Synthesizer<OpenJtalk> | Synthesizer<()>`として持つ #1999

Job	Run time
config	1s
build_and_deploy (windows-2019, directml, x86_64-pc-windows-msvc, windows-x64-directml, directml,...	6m 43s
deploy_model	7s
build_and_deploy (ubuntu-20.04, x86_64-unknown-linux-gnu, linux-x64-gpu, cuda, true)	2m 49s
build_and_deploy (macos-11, aarch64-apple-darwin, osx-arm64-cpu, cpu, false)	5m 10s
build_xcframework	0s
build_java_package	0s
download_test	0s
	14m 50s

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