build: Drop Python 3.8 support #760

Job	Run time
Lint content	1m 54s
Test machine readable to human-readable date/time using Nix	32s
Test Sentinel-1 using Nix	52s
Test Sentinel-1 on macos-12, using Poetry with Python 3.9	5m 32s
Test Sentinel-2 using Nix	1m 0s
Test Sentinel-2 on macos-12, using Poetry with Python 3.9	4m 30s
Test Sentinel-1 on macos-12, using Poetry with Python 3.11	5m 3s
Test Sentinel-2 on macos-12, using Poetry with Python 3.11	12m 47s
Test Sentinel-1 on ubuntu-22.04, using Poetry with Python 3.9	1m 34s
Test Sentinel-2 on ubuntu-22.04, using Poetry with Python 3.9	2m 19s
Test Sentinel-1 on ubuntu-22.04, using Poetry with Python 3.11	1m 54s
Test Sentinel-2 on ubuntu-22.04, using Poetry with Python 3.11	7m 29s
Test Sentinel-1 on windows-2022, using Poetry with Python 3.9	6m 9s
Test Sentinel-2 on windows-2022, using Poetry with Python 3.9	9m 29s
Test Sentinel-1 on windows-2022, using Poetry with Python 3.11	5m 54s
Test Sentinel-2 on windows-2022, using Poetry with Python 3.11	11m 11s
finalise	3s
	1h 18m 12s

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