ENH: compute hash without `PYTHONHASHSED` #671

Job	Run time
pytest / Determine job matrix	8s
style / Determine skipped pre-commit hooks	8s
doc / nb / Execute and build documentation	1m 4s
doc / linkcheck / Check external links	56s
pytest / Run unit tests (3.10, ubuntu-24.04)	1m 15s
pytest / Run unit tests (3.11, ubuntu-24.04)	1m 21s
pytest / Run unit tests (3.9, ubuntu-24.04)	1m 19s
pytest / Run unit tests (3.12, ubuntu-24.04, ampform)	4m 16s
pytest / Run unit tests (3.9, macos-14)	1m 11s
style / Run local pre-commit hooks	49s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	12m 27s

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