Update to haskell-src-exts-1.22.0

1.21.1 --> 1.22.0
=================
* Support Template Haskell typed splices and quotations (#432)
  - Breaking change: new constructors on Token data type
* Fix unicode identifier parsing (#442)

1.21.0 --> 1.21.1
=================
* GHC 8.8.1 compatibility (MonadFail)

1.20.3 --> 1.21.0
=================
* DerivingVia (#420)
* TypeInType  (#414)
* Parse TH-quoted list constructor (#415)

1.20.2 --> 1.20.3
=================
* GHC 8.6.1 compatability (MonadFail)
* Remove cpphs dependency

1.20.1 --> 1.20.2
=================
* Add fixity of (&)
* GHC 8.4.1 compatability

1.20.0 --> 1.20.1
===================
* Fix two test failures

1.19.1 --> 1.20.0
===================

* GHC 8.2 updates
* Add some missing Generics instances (#380)
* Support Template Haskell pattern splices (#352)
* Fix overloaded labels starting with _ (#362)
* Relax MultiParamTypeClass check (#333)
* DeriveAnyClass (#337)
* Deriving Strategies (#387)
* OVERLAPS/OVERLAPPING/OVERLAPPABLE pragmas
* Unboxed Sums
* Expression holes in infix expressions
* Support multiple pattern synonyms per pattern synonym signature
* COMPLETE pragmas
* Fix #309, remove unnecessary semi-colon from pretty printer
* Refine ExplicitNamespaces to properly export type operators

1.19.0 --> 1.19.1
===================

* Revert making fields of `SrcLoc` strict. (#340)

1.18.2 --> 1.19.0
===================

* Add JavaScriptFFI to known extensions (#335)
* Remove space when pretty printing `SrcLoc`. (#307)
* Don't reverse arguments in a context. (#328)
* Add support for EmptyCase extension (#255)

1.18.1 --> 1.18.2
===================

* Fix overzealous lexing of type applications

1.18.0 --> 1.18.1
===================

* Fix overzealous lexing of overloaded labels.

1.17.1 --> 1.18.0
===================

* Remove simplified AST
* GHC 8.0 update: Overloaded labels, type applications, pattern synonym
extensions, StrictData, injective type families

AST changes:

* Add TyQuasiQuote (#279).

Other changes:

* Only treat 'role' as a keyword in certain contexts (#286).
* Prettyprint '!' in patterns correctly when BangPatterns are enabled (#287).
* Parse magic hash with multiple trailing hashes (#300).
* Apply fixities inside pattern synonym builders
* Fix lexing of idents with multiple trailing #


(pho)