Bump parallel submodule
Bump parallel submodule

Includes testsuite fix for Python 3.

ezyang/ghc,shlevy/ghc,olsner/ghc,shlevy/ghc,olsner/ghc,mettekou/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,mettekou/ghc,mettekou/ghc,mettekou/ghc,ezyang/ghc,olsner/ghc,shlevy/ghc,mettekou/ghc,ezyang/ghc,shlevy/ghc,mettekou/ghc,olsner/ghc,sdiehl/ghc,olsner/ghc,sdiehl/ghc,ezyang/ghc,ezyang/ghc,olsner/ghc,shlevy/ghc,ezyang/ghc,sdiehl/ghc,sdiehl/ghc,olsner/ghc,mettekou/ghc,ezyang/ghc,sdiehl/ghc,sdiehl/ghc