[PostGIS] #5936: topology_upgrade.sql is not done in a single transaction

[PostGIS]

#5936: topology_upgrade.sql is not done in a single transaction
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.4.5
 Component:  topology  |    Version:  3.4.x
Resolution:            |   Keywords:
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Comment (by strk):

 And if we fix this, upgrades fail due to:
 > topology_upgrade.sql:1096: ERROR:  cannot drop cast from topogeometry to
 geometry because extension postgis_topology requires i
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5936#comment:1>
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