[OSGeoLive] #2343: Update version for documentation generation

[OSGeoLive]

#2343: Update version for documentation generation
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 Reporter:  cvvergara  |      Owner:  osgeolive@…
     Type:  task       |     Status:  new
 Priority:  normal     |  Milestone:
Component:  OSGeoLive  |   Keywords:
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 Use more recent versions for
 - Sphinx
 - cmake
 - and probably some more software that I don't have on my head

 To be decided: which version to use.

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Ticket URL: <https://trac.osgeo.org/osgeolive/ticket/2343>
OSGeoLive <https://live.osgeo.org/>
self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, that allows you to try a wide variety of open source geospatial software without installing anything.