ENH: compute hash without `PYTHONHASHSED` #665

Job	Run time
style / Determine skipped pre-commit hooks	9s
pytest / Determine job matrix	4s
doc / linkcheck / Check external links	51s
doc / nb / Execute and build documentation	1m 1s
pytest / Run unit tests (3.10, ubuntu-24.04)	1m 13s
pytest / Run unit tests (3.11, ubuntu-24.04)	1m 14s
pytest / Run unit tests (3.9, ubuntu-24.04)	1m 17s
pytest / Run unit tests (3.12, ubuntu-24.04, ampform)	4m 17s
pytest / Run unit tests (3.9, macos-14)	1m 27s
style / Run local pre-commit hooks	47s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	12m 20s

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