[PostGIS] #6094: downgrade error on berrie64 when standard conforming strings off

[PostGIS]

#6094: downgrade error on berrie64 when standard conforming strings off
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  Reporter:  robe     |      Owner:  strk
      Type:  defect   |     Status:  closed
  Priority:  blocker  |  Milestone:  PostGIS 3.6.5
 Component:  upgrade  |    Version:  3.6.x
Resolution:  fixed    |   Keywords:
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Comment (by Darafei Praliaskouski <me@…>):

 In [changeset:"4fd8c0d8bb0809d8fb7606374be0333ea36b81b3/git" 4fd8c0d/git]:
 {{{#!CommitTicketReference repository="git"
 revision="4fd8c0d8bb0809d8fb7606374be0333ea36b81b3"
 upgrade: escape version regex literals

 Use explicit escape string syntax for the version parsing regular
 expressions emitted by create_upgrade.pl. This keeps downgrade checks
 quiet and parser-stable when standard_conforming_strings is off.

 Closes #6094 for PostGIS 3.3

 Closes https://github.com/postgis/postgis/pull/1158
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6094#comment:3>
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