build(deps): bump haskell-actions/setup from 2.7.1 to 2.7.4

Bumps [haskell-actions/setup](https://github.com/haskell-actions/setup) from 2.7.1 to 2.7.4.
- [Release notes](https://github.com/haskell-actions/setup/releases)
- [Commits](haskell-actions/setup@64aa514...c9f45a3)

---
updated-dependencies:
- dependency-name: haskell-actions/setup
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/tests.yml

@@ -105,7 +105,7 @@ jobs:
           key: ${{ steps.resolve-resolver.outputs.resolver }}-${{ steps.week-no.outputs.week-no }}-${{ hashFiles('exercises/**/package.yaml') }}
           restore-keys: ${{ steps.resolve-resolver.outputs.resolver }}-${{ steps.week-no.outputs.week-no }}-
 
-      - uses: haskell-actions/setup@64aa5146ed5bd91f181552b8b5fbe50fbd2bd3fe
+      - uses: haskell-actions/setup@c9f45a3b95314ad5e889bd19d5c5a3fa8c6e24d4
         with:
           enable-stack: true
           stack-version: "latest"