[PostGIS] #6103: debbie can't build docs

[PostGIS]

#6103: debbie can't build docs
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  Reporter:  robe          |      Owner:  robe
      Type:  defect        |     Status:  new
  Priority:  blocker       |  Milestone:  PostGIS 3.7.0
 Component:  QA/buildbots  |    Version:  master
Resolution:                |   Keywords:
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Comment (by robe):

 its a little strange though that woodie did not have an issue with this
 when building the docs but debbie does.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6103#comment:2>
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