[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 3.5.0
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:
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Comment (by strk):

 Where the WARNING was seen is here:
 PG12: https://woodie.osgeo.org/repos/30/pipeline/1822/9#L1048
 PG15: https://woodie.osgeo.org/repos/30/pipeline/1822/10#L1048

 Both with standard_conforming_strings off and escape_string_warning on
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5678#comment:2>
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