[MacPorts] #68302: ghc fails to install because of py310-sphinx v7+ does not support style key

[MacPorts]

#68302: ghc fails to install because of py310-sphinx v7+ does not support style key
---------------------+--------------------
 Reporter:  breiter  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.8.1
 Keywords:           |       Port:  ghc
---------------------+--------------------
 GHC itself compiles successfully but the documentation build step fails
 which causes the entire port to fail.

 This is a problem for ghc @2.6.2 and the @2.6.3 pull request.

 https://github.com/sphinx-doc/sphinx/pull/11381

 https://gitlab.haskell.org/ghc/ghc/-/issues/23444

 see also
 https://github.com/macports/macports-ports/pull/20649

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Ticket URL: <https://trac.macports.org/ticket/68302>
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