build: Install Poetry with pipx #799

Job	Run time
Test machine readable to human-readable date/time using Nix	43s
Test Sentinel-1 using Nix	1m 2s
Lint content	2m 7s
Test Sentinel-2 using Nix	1m 18s
Test Sentinel-1 on macos-12, using Poetry with Python 3.9	2m 59s
Test Sentinel-2 on macos-12, using Poetry with Python 3.9	3m 21s
Test Sentinel-1 on macos-12, using Poetry with Python 3.11	3m 50s
Test Sentinel-2 on macos-12, using Poetry with Python 3.11	8m 54s
Test Sentinel-1 on ubuntu-22.04, using Poetry with Python 3.9	1m 19s
Test Sentinel-2 on ubuntu-22.04, using Poetry with Python 3.9	2m 29s
Test Sentinel-1 on ubuntu-22.04, using Poetry with Python 3.11	1m 32s
Test Sentinel-2 on ubuntu-22.04, using Poetry with Python 3.11	6m 52s
Test Sentinel-1 on ubuntu-24.04, using Poetry with Python 3.9	1m 44s
Test Sentinel-2 on ubuntu-24.04, using Poetry with Python 3.9	2m 10s
Test Sentinel-1 on ubuntu-24.04, using Poetry with Python 3.11	2m 17s
Test Sentinel-2 on ubuntu-24.04, using Poetry with Python 3.11	8m 54s
Test Sentinel-1 on windows-2022, using Poetry with Python 3.9	5m 48s
Test Sentinel-2 on windows-2022, using Poetry with Python 3.9	5m 44s
Test Sentinel-1 on windows-2022, using Poetry with Python 3.11	7m 23s
Test Sentinel-2 on windows-2022, using Poetry with Python 3.11	9m 54s
finalise	3s
	1h 20m 23s

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