Bump mtl, parsec, text submodules
These three submodules have commits which add certain files to their respective .gitignores which GHC's build system produces. Also update the packages file accordingly. Test Plan: If it builds, ship it Reviewers: hvr, austin, bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3842
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