[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
----------------------+---------------------------
  Reporter:  robe     |      Owner:  robe
      Type:  task     |     Status:  assigned
  Priority:  blocker  |  Milestone:  PostGIS 3.5.0
 Component:  build    |    Version:  master
Resolution:           |   Keywords:
----------------------+---------------------------
Description changed by robe:

Old description:

> As noted in PostGIS Dev mailing list
>
> https://lists.osgeo.org/pipermail/postgis-devel/2023-October/030147.html
>
> https://lists.osgeo.org/pipermail/postgis-devel/2023-October/030149.html
> The plan is to drop GEOS 3.6 and GEOS 3.7. 3 + votes and no - votes.
>
> As part of that, the following needs to happen
>
> * Revise configure to not allow building for GEOS < 3.8
> * Remove all ifdefs in code and tests for GEOS 3.6 and 3.7
> * Stop ci testing on 3.6 and 3.7
>    * Woodie/Dronie - I've already upped the GEOS from 3.6 to 3.10 and
> looks like build passed.
>    * Remove 3.7 testing from Github Actions
>       * The 3.7 matrix is the only one testing proj6 and pg12, so we
> should probably replace with slightly newer that has all but geos38
> instead of 37

New description:

 As noted in PostGIS Dev mailing list

 https://lists.osgeo.org/pipermail/postgis-devel/2023-October/030147.html

 https://lists.osgeo.org/pipermail/postgis-devel/2023-October/030149.html
 The plan is to drop GEOS 3.6 and GEOS 3.7. 3 + votes and no - votes.

 As part of that, the following needs to happen

 * Revise configure to not allow building for GEOS < 3.8
 * Update doc references in postgis.xml (and any hard-coded in docs)
 * Remove all ifdefs in code and tests for GEOS 3.6 and 3.7
 * Stop ci testing on 3.6 and 3.7
    * Woodie/Dronie - I've already upped the GEOS from 3.6 to 3.10 and
 looks like build passed.
    * Remove 3.7 testing from Github Actions
       * The 3.7 matrix is the only one testing proj6 and pg12, so we
 should probably replace with slightly newer that has all but geos38
 instead of 37

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5602#comment:1>
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