chore: bump version to v5.4.3rc1 #106

Job	Run time
check-version	13s
build / build-installer	2m 11s
frontend-checks / frontend-checks	1m 30s
frontend-tests / frontend-tests	56s
python-checks / python-checks	32s
python-tests / py3.10: linux-cuda-11_7	4m 6s
python-tests / py3.10: linux-rocm-5_2	5m 35s
python-tests / py3.10: linux-cpu	4m 29s
python-tests / py3.10: macos-default	3m 31s
python-tests / py3.10: windows-cpu	11m 10s
python-tests / py3.11: linux-cuda-11_7	4m 29s
python-tests / py3.11: linux-rocm-5_2	4m 22s
python-tests / py3.11: linux-cpu	4m 36s
python-tests / py3.11: macos-default	4m 9s
python-tests / py3.11: windows-cpu	10m 19s
publish-pypi	19s
publish-testpypi	18s
	1h 2m 45s

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