`Synthesizer`から`Mutex`を外す (#666) #2233

Job	Run time
actionlint	26s
c-header	1m 18s
rust-lint	3m 42s
rust-unit-test	7m 48s
shellcheck	17s
validate-cargo-lock	29s
build-and-test-java-api (windows-latest)	11m 21s
build-and-test-java-api (macos-latest)	7m 44s
build-and-test-java-api (ubuntu-latest)	4m 6s
build-and-test-python-api (windows-latest)	12m 20s
build-and-test-python-api (macos-latest)	4m 53s
build-and-test-python-api (ubuntu-latest)	3m 50s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	2m 48s
build-windows-cpp-example	8m 1s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	3m 6s
rust-integration-test-strategy-matrix	2s
rust-integration-test (windows-2019, directml)	4m 41s
rust-integration-test (macos-11)	3m 14s
rust-integration-test (ubuntu-20.04)	2m 10s
	1h 22m 16s

Provide feedback