[PostGIS] #5851: pg18 support

[PostGIS]

#5851: pg18 support
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  Reporter:  RekGRpth  |      Owner:  pramsey
      Type:  defect    |     Status:  closed
  Priority:  medium    |  Milestone:  PostGIS 3.5.3
 Component:  postgis   |    Version:  master
Resolution:  fixed     |   Keywords:
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Comment (by Darafei Praliaskouski <me@…>):

 In [changeset:"56a3c6e3099d1e7da4326400779b23b8e3e7c634/git" 56a3c6e/git]:
 {{{#!CommitTicketReference repository="git"
 revision="56a3c6e3099d1e7da4326400779b23b8e3e7c634"
 Fix regress error on pg18
 Explain now returns fractional for actual rows for some reason
 Closes #5851 for PostGIS 3.5.3

 (cherry picked from commit 8b1bb8316bab89f0433cf36ee085974b5acdeec8)
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5851#comment:7>
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