Bump haskell/actions from 1 to 2

Bumps [haskell/actions](https://github.com/haskell/actions) from 1 to 2.
- [Release notes](https://github.com/haskell/actions/releases)
- [Commits](haskell/actions@v1...v2)

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

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

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/main'
-    - uses: haskell/actions/setup@v1
+    - uses: haskell/actions/setup@v2
       name: Setup Haskell
       with:
         ghc-version: ${{ matrix.ghc }}