chore: bump version to v4.2.9rc1 #55

Job	Run time
check-version	11s
frontend-checks / frontend-checks	1m 32s
build / build-installer	1m 13s
frontend-tests / frontend-tests	57s
python-checks / python-checks	13s
python-tests / py3.10: linux-cuda-11_7	4m 15s
python-tests / py3.10: linux-rocm-5_2	4m 11s
python-tests / py3.10: linux-cpu	3m 21s
python-tests / py3.10: macos-default	3m 2s
python-tests / py3.10: windows-cpu	11m 4s
python-tests / py3.11: linux-cuda-11_7	3m 42s
python-tests / py3.11: linux-rocm-5_2	3m 55s
python-tests / py3.11: linux-cpu	3m 36s
python-tests / py3.11: macos-default	3m 3s
python-tests / py3.11: windows-cpu	6m 44s
publish-pypi	42s
publish-testpypi	32s
	52m 13s

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