[PostGIS] #5602: GEOS 3.6 and GEOS 3.7 drop for PostGIS 3.5.0

[PostGIS]

#5602: GEOS 3.6 and GEOS 3.7 drop for PostGIS 3.5.0
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  Reporter:  robe     |      Owner:  robe
      Type:  task     |     Status:  assigned
  Priority:  blocker  |  Milestone:  PostGIS 3.5.0
 Component:  build    |    Version:  master
Resolution:           |   Keywords:
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Comment (by robe):

 Okay I found a GHA image - pg12-geos38-gdal30-proj611 so swapping out the
 gha pg12-geos37-gdal30-proj611 with that
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5602#comment:2>
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