Log Message:
textproc/hs-megaparsec: Update to 9.3.0

Megaparsec 9.3.0
* Now label can override more than one group of hints in the parser it
  wraps. Issue 482.
* takeP n now returns the empty chunk of the input stream when n is
  negative, similar to when n == 0. Issue 497.
* Added the MonadParsecDbg type class in Text.Megaparsec.Debug. The type
  class allows us to use dbg in MTL monad transformers. Issue 488.
* Introduced the ShareInput and NoShareInput newtype wrappers in
  Text.Megaparsec.Stream in order to allow the user to choose how the input
  should be sliced and shared during the parsing. Issue 492.

Megaparsec 9.2.2
* Fixed a space leak in the implementations of the reachOffset and
  reachOffsetNoLine methods of TraversableStream. Issue 486.

Megaparsec 9.2.1
* Builds with mtl-2.3 and transformers-0.6.