Removed Python 3.8 support (#916) #3746

Job	Run time
code-quality	4m 32s
build (ubuntu-latest, 3.9, 1.10.15)	49m 21s
docs	5m 33s
build (ubuntu-latest, 3.9, 2.7.1)	50m 25s
licenses	49s
build (ubuntu-latest, 3.10, 1.10.15)	52m 37s
optional_dependencies (default)	51s
build (ubuntu-latest, 3.10, 2.7.1)	50m 13s
optional_dependencies (tensorflow)	1m 25s
build (ubuntu-latest, 3.11, 1.10.15)	51m 17s
optional_dependencies (torch)	2m 6s
build (ubuntu-latest, 3.11, 2.7.1)	50m 36s
optional_dependencies (prophet)	54s
build (windows-latest, 3.10, 1.10.15)	54m 16s
optional_dependencies (keops)	2m 9s
build (windows-latest, 3.10, 2.7.1)	54m 9s
optional_dependencies (all)	2m 49s
	7h 14m 2s

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