Updating tools/mdslicer tool version(s)

[planemo-autoupdate]

Hello! This is an automated update of the following tool: tools/mdslicer. I created this PR because I think the tool's main dependency is out of date, i.e. there is a newer version available through conda.

Please see https://github.com/planemo-autoupdate/autoupdate for more information.

[simonbray]

@bgruening I'm quite happy with this I think. Shall we try and implement on your galaxytools repo next and see what new issues we find?

[bgruening]

Cool, yes please!