Log Message:
textproc/hs-megaparsec: Update to 9.6.0

Megaparsec 9.6.0
* Added the functions initialState and initialPosState to Text.Megaparsec.State. \ 
Issue 449.

Megaparsec 9.5.0
* Dropped a number of redundant constraints here and there. PR 523.
* Added a MonadWriter instance for ParsecT. PR 534.

Megaparsec 9.4.1
* Removed Monad m constraints in several places where they were introduced in \ 
9.4.0. Issue 532.

Megaparsec 9.4.0
* dbg now prints hints among other debug information. PR 530.
* Hints are no longer lost in certain methods of MTL instances for
  ParsecT. Issue 528.
* Added a new method to the MonadParsec type class—mkParsec. This can be
  used to construct “new primitives” with arbitrary behavior at the expense
  of having to dive into Megaparsec's internals. PR 514.

Megaparsec 9.3.1
* Fixed a bug related to processing of tabs when error messages are
  rendered. Issue 524.