[PostGIS] #5779: create_upgrade.pl fails for 3.5.0-beta1

[PostGIS]

#5779: create_upgrade.pl fails for 3.5.0-beta1
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  Reporter:  Bas Couwenberg  |      Owner:  strk
      Type:  defect          |     Status:  new
  Priority:  medium          |  Milestone:  PostGIS 3.5.0
 Component:  build           |    Version:  master
Resolution:                  |   Keywords:
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Comment (by robe):

 #5780 might be a duplicate but started seeing it recently so had flagged
 as a separate.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5779#comment:8>
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