Remove support for Python 3.8 #2817

Job	Run time
Run CI / Check examples / Check examples	3m 27s
Run CI / Check NIMG / Check NIMG	39s
Run CI / Check NIMS / Check NIMS	1m 2s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.9)	2m 28s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.10)	2m 33s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.11)	2m 43s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.12)	3m 13s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.9)	1m 58s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.10)	2m 7s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.11)	1m 52s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.12)	2m 51s
Run CI / Run system tests / Run system tests (py32)	27m 10s
Run CI / Run system tests / Run system tests (py64)	24m 12s
Run CI / Report test results / Report test results	19s
	1h 16m 34s

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