[PostGIS] #5678: WARNING: nonstandard use of escape in a string literal

[PostGIS]

#5678: WARNING:  nonstandard use of escape in a string literal
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.3.6
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:
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Changes (by strk):

 * milestone:  PostGIS 3.5.0 => PostGIS 3.3.6

Comment:

 Setting milestone to 3.3.6 as we didn't fix other
 standard_conforming_string related problem in 3.2 or earlier
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5678#comment:6>
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