build: add back support for python3.8 #56

Job	Run time
check-manifest	10s
check-manifest	10s
test (macos-latest, 3.11) / macos-latest py3.11 pyqt6	38s
test (macos-latest, 3.11) / macos-latest py3.11 pyqt6	38s
test (macos-latest, 3.10) / macos-latest py3.10 pyqt6	41s
test (macos-latest, 3.10) / macos-latest py3.10 pyqt6	41s
test (ubuntu-latest, 3.10) / ubuntu-latest py3.10 pyqt6	1m 0s
test (ubuntu-latest, 3.10) / ubuntu-latest py3.10 pyqt6	1m 0s
test (macos-latest, 3.8) / macos-latest py3.8 pyqt6	1m 34s
test (macos-latest, 3.8) / macos-latest py3.8 pyqt6	1m 34s
test (ubuntu-latest, 3.11) / ubuntu-latest py3.11 pyqt6	1m 7s
test (ubuntu-latest, 3.11) / ubuntu-latest py3.11 pyqt6	1m 7s
test (ubuntu-latest, 3.8) / ubuntu-latest py3.8 pyqt6	1m 28s
test (ubuntu-latest, 3.8) / ubuntu-latest py3.8 pyqt6	56s
test-array-libs (macos-latest, 3.12) / macos-latest py3.12 pyqt6	1m 17s
test-array-libs (macos-latest, 3.12) / macos-latest py3.12 pyqt6	1m 17s
test-array-libs (macos-latest, 3.9) / macos-latest py3.9 pyqt6	2m 40s
test-array-libs (macos-latest, 3.9) / macos-latest py3.9 pyqt6	2m 40s
test-array-libs (ubuntu-latest, 3.12) / ubuntu-latest py3.12 pyqt6	3m 5s
test-array-libs (ubuntu-latest, 3.12) / ubuntu-latest py3.12 pyqt6	3m 5s
test-array-libs (ubuntu-latest, 3.9) / ubuntu-latest py3.9 pyqt6	2m 58s
test-array-libs (ubuntu-latest, 3.9) / ubuntu-latest py3.9 pyqt6	2m 58s
Deploy	0s
Deploy	0s
upload_coverage / Upload coverage	20s
upload_coverage / Upload coverage	15s
	33m 19s

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