bump version 4.2.1 (#1674) #2744

Job	Run time
build-and-push-docker-images	3m 15s
build-python-wheels (ubuntu-20.04, auto64)	1h 58m 53s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 48s
build-python-wheels (macos-11, auto64)	38m 51s
build-and-test-cpp-aarch64 (openblas)	5m 25s
build-python-wheels (windows-2019, auto64)	5h 19m 29s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 53s
build-python-wheels (ubuntu-20.04, aarch64)	1h 15m 54s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 45s
check-python-style	12s
build-python-wheels (macos-11, arm64)	6h 0m 16s
build-and-test-cpp-x86_64 (macos-11, dnnl)	10m 6s
test-python-wheels	0s
build-and-deploy-docs	0s
publish-python-wheels-on-pypi	0s
	15h 54m 47s

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