tests: cache sample files #1150

Job	Run time
Setup	14s
Python 3.11 macos-latest build	2m 5s
Python 3.10 windows-latest build	1m 2s
Python 3.10 ubuntu-latest build	2m 32s
Python 3.10 macos-latest build	1m 58s
Python 3.12 ubuntu-latest build	2m 43s
Python 3.11 ubuntu-latest build	2m 47s
Python 3.14t ubuntu-latest build	2m 43s
Python 3.14t macos-latest build	3m 14s
Python 3.14 macos-latest build	1m 56s
Python 3.14t windows-latest build	1m 59s
Python 3.13 ubuntu-latest build	2m 40s
Python 3.12 macos-latest build	2m 25s
Python 3.11 windows-latest build	1m 50s
Python 3.14 ubuntu-latest build	2m 36s
Python 3.14 windows-latest build	1m 3s
Python 3.13 windows-latest build	1m 4s
Python 3.13 macos-latest build	2m 53s
Python 3.12 windows-latest build	1m 1s
	38m 45s

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