Test PyGLM on various systems and Python versions

Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows #342

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Run time

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Job	Run time
test-build (ubuntu-latest, 3.8)	4m 47s
test-build (ubuntu-latest, 3.9)	4m 58s
test-build (ubuntu-latest, 3.10)	5m 2s
test-build (ubuntu-latest, 3.11)	5m 7s
test-build (ubuntu-latest, 3.12)	5m 7s
test-build (macos-latest, 3.8)	3m 36s
test-build (macos-latest, 3.9)	3m 14s
test-build (macos-latest, 3.10)	3m 53s
test-build (macos-latest, 3.11)	4m 5s
test-build (macos-latest, 3.12)	3m 13s
test-build (windows-latest, 3.8)	3m 13s
test-build (windows-latest, 3.9)	3m 10s
test-build (windows-latest, 3.10)	3m 2s
test-build (windows-latest, 3.11)	2m 56s
test-build (windows-latest, 3.12)	3m 2s
	58m 25s