[GHC] #10304: Bump Cabal submodule

[GHC]

#10304: Bump Cabal submodule
-------------------------------------+-------------------------------------
        Reporter:  luite             |                   Owner:  hvr
            Type:  task              |                  Status:  merge
        Priority:  high              |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by hvr):

 * priority:  normal => high


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10304#comment:4>
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