[GHC] #13808: Bump Cabal submodule

[GHC]

#13808: Bump Cabal submodule
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.2.1-rc2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Cabal 2.0.0.1 will be released shortly

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13808>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler