fix: OS -> RUNNER_OS #3272

Job	Run time
actionlint	18s
validate-cargo-lock	21s
shellcheck	13s
build-windows-cpp-example	3m 13s
c-header	46s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	1m 36s
rust-integration-test-strategy-matrix	1s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 39s
rust-lint	8m 31s
rust-unit-test	9m 40s
build-and-test-java-api (windows-latest)	7m 55s
build-and-test-java-api (macos-latest)	2m 56s
build-and-test-java-api (ubuntu-latest)	3m 10s
build-and-test-python-api (windows-latest)	7m 44s
build-and-test-python-api (macos-latest)	3m 47s
build-and-test-python-api (ubuntu-latest)	3m 33s
rust-integration-test (macos-13)	7m 9s
rust-integration-test (ubuntu-20.04)	4m 32s
	1h 7m 4s

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