Update ormolu to 0.7.4.0

[janmasrovira]

This pr updates the version of ormolu to 0.7.4.0. Moreover, we drop the mrkkrp/ormolu-action github action. Instead, we invoke the ormolu version that is in the stackage snapshot selected in the stack.yaml file.

One can locally install the new version thus:

cd juvix
stack install ormolu

The output of ormolu --version should be

ormolu 0.7.4.0
using ghc-lib-parser 9.8.2.20240223

Questionable changes