Improve GitHub Actions Security #218

Job	Run time
Poetry install and check (ubuntu-latest, 3.8)	49s
Poetry install and check (ubuntu-latest, 3.9)	36s
Poetry install and check (ubuntu-latest, 3.10)	39s
Poetry install and check (ubuntu-latest, 3.11)	43s
Poetry install and check (ubuntu-latest, 3.12)	51s
Poetry install and check (ubuntu-latest, 3.13)	54s
Poetry install and check (windows-latest, 3.8)	4m 17s
Poetry install and check (windows-latest, 3.9)	3m 3s
Poetry install and check (windows-latest, 3.10)	2m 51s
Poetry install and check (windows-latest, 3.11)	2m 49s
Poetry install and check (windows-latest, 3.12)	2m 46s
Poetry install and check (windows-latest, 3.13)	3m 55s
Poetry install and check (macos-latest, 3.8)	1m 21s
Poetry install and check (macos-latest, 3.9)	1m 6s
Poetry install and check (macos-latest, 3.10)	1m 25s
Poetry install and check (macos-latest, 3.11)	1m 9s
Poetry install and check (macos-latest, 3.12)	45s
Poetry install and check (macos-latest, 3.13)	48s
	30m 47s

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