[postgis-tickets] [PostGIS] #4701: Travis: Add build based on PG REL_13_STABLE

[PostGIS]

#4701: Travis: Add build based on PG REL_13_STABLE
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 Reporter:  Algunenano   |      Owner:  pramsey
     Type:  enhancement  |     Status:  new
 Priority:  medium       |  Milestone:  PostGIS 3.1.0
Component:  postgis      |    Version:  master
 Keywords:               |
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 The new branch is now available (REL_13_STABLE) so we should create a new
 build image with that (and keep the one PG master/HEAD).

 This image should build against latest **stable** releases of other
 dependencies (GEOS, GDAL and so on) which means it will hit the same
 errors as #4673

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4701>
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