chore: bump version to v4.2.8rc1 #43

Job	Run time
check-version	11s
build / build-installer	1m 21s
frontend-checks / frontend-checks	1m 30s
frontend-tests / frontend-tests	51s
python-checks / python-checks	19s
python-tests / py3.10: linux-cuda-11_7	3m 59s
python-tests / py3.10: linux-rocm-5_2	4m 2s
python-tests / py3.10: linux-cpu	3m 9s
python-tests / py3.10: macos-default	4m 15s
python-tests / py3.10: windows-cpu	8m 5s
python-tests / py3.11: linux-cuda-11_7	4m 7s
python-tests / py3.11: linux-rocm-5_2	4m 9s
python-tests / py3.11: linux-cpu	3m 1s
python-tests / py3.11: macos-default	4m 17s
python-tests / py3.11: windows-cpu	7m 46s
publish-pypi	24s
publish-testpypi	29s
	51m 55s

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