build(deps): bump haskell-actions/setup from 2.6.3 to 2.7.1 (#1239)

Bumps [haskell-actions/setup](https://github.com/haskell-actions/setup) from 2.6.3 to 2.7.1.
- [Release notes](https://github.com/haskell-actions/setup/releases)
- [Commits](haskell-actions/setup@2492c12...64aa514)

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

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

.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@2492c1286a5abeb29df728c4916e761ebf58a9cd
+      - uses: haskell-actions/setup@64aa5146ed5bd91f181552b8b5fbe50fbd2bd3fe
         with:
           enable-stack: true
           stack-version: "latest"