[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:  new
 Priority:  medium        |  Milestone:  Website Management, Bots
Component:  QA/buildbots  |    Version:
 Keywords:                |
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 See https://trac.osgeo.org/postgis/ticket/5792#comment:5
 We probably need to upgrade GEOS in the postgis-build-env docker image,
 possibly incurring in issues with Relate and Boundary Node Rule ( #5805 )
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5806>
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