Detekt to 1.9.0

[cortinico]

Just keeping our Detekt version up to date

[macisamuele]

@cortinico update https://github.com/Yelp/swagger-gradle-codegen/blob/master/.github/workflows/pre-merge.yaml#L16 to have green tests and then feel free to merge.

tip: as the python venv is needed to install pre-commit only, I would install 3.7 (without specifying the patch version).

PS. a list of actions have a new version, we might want to update that as well (actions/checkout, actions/setup-python

edit: @cortinico took care of the test-failures and actions update in #130

[codecov]

Codecov Report

Merging #129 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #129   +/-   ##
=========================================
  Coverage     74.56%   74.56%           
  Complexity      173      173           
=========================================
  Files            11       11           
  Lines           684      684           
  Branches         86       86           
=========================================
  Hits            510      510           
  Misses          128      128           
  Partials         46       46           

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