[PostGIS] #5891: autogen.sh fails on Debian 12 (trixie)

[PostGIS]

#5891: autogen.sh fails on Debian 12 (trixie)
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 Reporter:  strk    |      Owner:  strk
     Type:  defect  |     Status:  new
 Priority:  medium  |  Milestone:  PostGIS 3.6.0
Component:  build   |    Version:  master
 Keywords:          |
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 From https://www.ict.inaf.it/gitlab/postgis/postgis/-/jobs/115329#L2728

 > ./autogen.sh: 70: test: Illegal number: Debian-2
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5891>
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