tests

[ENH] add caching action for elephant-data #913

Job	Run time
test-pip (3.11, windows-latest)	12m 59s
test-pip-MPI (3.9, ubuntu-latest)	5m 58s
docs (ubuntu-latest)	5m 54s
build-and-test-pip (3.9, ubuntu-latest)	5m 5s
build-and-test-pip (3.10, ubuntu-latest)	5m 18s
doctests (3.10, ubuntu-latest)	1m 43s
conda (3.11, macos-12)	9m 18s
conda (3.11, macos-13)	10m 17s
build-and-test-pip (3.11, ubuntu-latest)	4m 48s
build-and-test-pip (3.12, ubuntu-latest)	5m 23s
test-conda (3.11, ubuntu-latest)	5m 12s
	1h 11m 55s

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