Bump haskell-actions/setup from 2.8.0 to 2.8.1 (#300)

Bumps [haskell-actions/setup](https://github.com/haskell-actions/setup) from 2.8.0 to 2.8.1.
- [Release notes](https://github.com/haskell-actions/setup/releases)
- [Commits](haskell-actions/setup@96f3daf...7909071)

---
updated-dependencies:
- dependency-name: haskell-actions/setup
  dependency-version: 2.8.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/build.yaml

@@ -32,7 +32,7 @@ jobs:
           key: build-${{ hashFiles('app/**', 'src/**', 'test/**') }}
           restore-keys: build-
 
-      - uses: haskell-actions/setup@96f3dafd067155f32643c2a0757ab71d2910e2c2 # v2.8.0
+      - uses: haskell-actions/setup@7909071ceec0344debcc968c6c7a96a52e8dd0d7 # v2.8.1
         with:
           enable-stack: true