Bump csvtk and change stageIn pattern of csvtk/concat

[dialvarezs]

Bumps csvtk version on modules csvtk/concat, csvtk/join and csvtk/split.
It also modifies the input pattern of csvtk/concat to prevent name clashes.

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[dialvarezs]

I added the same file twice to the test to really check if repeated filenames are handled as expected.

[SPPearce]

Looks good to me then.