Tests

Merge pull request #624 from Blosc/ctable-varlen-cols #3405

Job	Run time
Build and test on ubuntu-latest (python 3.12)	13m 8s
Build and test on windows-latest (python 3.12)	19m 49s
Build and test on ubuntu-latest (numpy 1.26)	11m 24s
Build and test on ubuntu-latest (python 3.14)	12m 27s
Build and test on macos-latest (python 3.12)	11m 29s
	1h 8m 17s

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