ci: bump actions/checkout, actions/upload-artifact and actions/downlo… #262

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Job	Run time
Site	25s
Slides (2020_03)	1m 42s
Slides (2021_05)	2m 7s
Slides (2022_05)	1m 45s
Slides (2023_05)	2m 14s
📦 Release	14s
	8m 27s