[PostGIS] #5611: Remove the workaround for pgaudit being too verbose.

[PostGIS]

#5611: Remove the workaround for pgaudit being too verbose.
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  Reporter:  mnencia      |      Owner:  pramsey
      Type:  enhancement  |     Status:  new
  Priority:  medium       |  Milestone:  PostGIS 3.5.0
 Component:  postgis      |    Version:  3.4.x
Resolution:               |   Keywords:
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Comment (by Paul Ramsey <pramsey@…>):

 In [changeset:"d4306cb9351d6d343fdea702c075911450e44ec6/git" d4306cb/git]:
 {{{#!CommitTicketReference repository="git"
 revision="d4306cb9351d6d343fdea702c075911450e44ec6"
 Only run pgaudit extension install test for PgSQL >= 15, references #5611
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5611#comment:8>
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