Log Message:
devel/happy: update to happy-2.1.3

## 2.1.2

Fix a breaking change (#325) introduced by the previous fix for #131.
Prelude is no longer used by Happy.

## 2.1.1

This release fixes two breaking changes:

* Properly qualify all uses of Prelude functions, fixing #131
* Bring back the old `%errorhandlertype` directive, the use of which is
  discouraged in favour of the "Reporting expected tokens" mechanism
  in Happy 2.1, accesible via `%error.expected`.

## 2.1

* Added `--numeric-version` CLI flag.
* Documented and implemented the new feature "Resumptive parsing with \ 
``catch``"
* Documented (and reimplemented) the "Reporting expected tokens" feature
  (which turned to cause a breaking change in this release: #320)

## 2.0.2

The 2.0.1 release in turn exposed two more regressions:

* Generated code uses PatternGuards without declaring it (#309)
* Use of `happy-lib:*` syntax to depend on private library components triggered
  a bug in Cabal versions 3.0 and 3.2 (#311)

This release fixes both.

## 2.0.1

The 2.0 release changed the indentation character from tabs to two spaces, \ 
triggering an
unforced breaking change in GHC (#303).
This release provides the fix by using eight spaces for indentation.

## 2.0

There are two main breaking changes in this release:

1. Removed non-array, non-GHC modes, so flags `-ag` are the default now and
   become no-ops.
2. Generated parsers now activate the language extension `-XNoStrictData` without
   which every use of a happy parser would lead to an immediate crash (#273).
   This causes us to drop support for GHC < 8.0.

Furthermore, the project structure was modularized and a library `happy-lib`
containing the implmentation of the `happy` executable was extracted.

Quite similar to the situation with GHC vs. the GHC API, we expect that `happy`
will continue to be a stable CLI tool with solid (if occasionally out of date)
documentation, while the design, documentation and implementation of `happy-lib`
is still in flux and use is only recommended to expert users.

Other, more minor changes:

* Revert the new bootstrapping system of 1.21.0 to mitigate build issues (#255, \ 
#274).

* Encode action table offsets in 32 bit instead of 16 bit (#93, #199, #266).
  This increases the size of generated parsers a bit (about 250KB for GHC's
  parser), but also manages to generate parsers for grammars that were
  previously running into the size limit (#199).

* The documentation has been converted to ReStructuredText,
  hosted at https://haskell-happy.readthedocs.io/en/latest/ (#226)

* A few internal refactorings to the structure of generated code.