[PostGIS] #6054: Lock down search path during install

[PostGIS]

#6054: Lock down search path during install
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 Reporter:  robe     |      Owner:  robe
     Type:  defect   |     Status:  assigned
 Priority:  medium   |  Milestone:  PostGIS 3.2.10
Component:  install  |    Version:  3.2.x
 Keywords:           |
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 Reported by Tigerdata Sven Klemm.

 This could allow non-super users to upgrade themselves to super user if
 they are allowed
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6054>
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