[PostGIS] #5965: PG19 compile is spitting out warnings about PG_GSERIALIZED_DATUM_NEEDS_DETOAST

[PostGIS]

#5965: PG19 compile is spitting out warnings about
PG_GSERIALIZED_DATUM_NEEDS_DETOAST
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  PostGIS 3.7.0
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by Laurenz Albe):

 The cause for the problem is [https://postgr.es/c/2a600a93c7 PostgreSQL
 commit 2a600a93c7], which changed the data type of `Datum` from
 `uintptr_t` to `uint64_t`.

 So it is no longer safe to assume that a `Datum` is a pointer, and you
 have to use `DatumGetPointer()` in all the places that did.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5965#comment:5>
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