[PostGIS] #5806: GitHub CI fails testsuite when running against GEOS-3.8.2

[PostGIS]

#5806: GitHub CI fails testsuite when running against GEOS-3.8.2
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  Reporter:  strk          |      Owner:  robe
      Type:  defect        |     Status:  closed
  Priority:  medium        |  Milestone:  Website Management, Bots
 Component:  QA/buildbots  |    Version:
Resolution:  invalid       |   Keywords:
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Changes (by strk):

 * resolution:   => invalid
 * status:  new => closed

Comment:

 I was wrong, upgrading to 3.8.4 won't fix the issue, let's deal with this
 in #5792
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5806#comment:1>
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