Bump mdgriffith/elm-codegen from 4.1.1 to 4.2.0 (#85)

Bumps [mdgriffith/elm-codegen](https://github.com/mdgriffith/elm-codegen) from 4.1.1 to 4.2.0.
- [Commits](mdgriffith/elm-codegen@4.1.1...4.2.0)

---
updated-dependencies:
- dependency-name: mdgriffith/elm-codegen
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

elm.json

@@ -40,7 +40,7 @@
             "jluckyiv/elm-utc-date-strings": "1.0.0",
             "joshuanianji/github-language-colors": "2.1.0",
             "justinmimbs/date": "4.1.0",
-            "mdgriffith/elm-codegen": "4.1.1",
+            "mdgriffith/elm-codegen": "4.2.0",
             "miniBill/elm-codec": "2.1.0",
             "noahzgordon/elm-color-extra": "1.0.2",
             "robinheghan/fnv1a": "1.0.0",