bump version 4.2.0 #2732

Job	Run time
build-and-test-cpp-aarch64 (openblas)	4m 2s
build-and-push-docker-images	1h 47m 53s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 3s
build-python-wheels (ubuntu-20.04, auto64)	1h 58m 35s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 23s
build-python-wheels (macos-11, auto64)	35m 36s
check-python-style	9s
build-and-test-cpp-x86_64 (macos-11, mkl)	11m 3s
build-python-wheels (windows-2019, auto64)	5h 34m 42s
build-and-test-cpp-x86_64 (macos-11, dnnl)	10m 52s
build-python-wheels (ubuntu-20.04, aarch64)	1h 14m 17s
build-python-wheels (macos-11, arm64)	15m 53s
test-python-wheels (ubuntu-20.04)	9m 2s
build-and-deploy-docs	1m 13s
test-python-wheels (macos-11)	8m 53s
test-python-wheels (windows-2019)	4m 33s
publish-python-wheels-on-pypi	0s
	12h 28m 9s

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