chore(deps): bump haskell-actions/setup in the actions group

Bumps the actions group with 1 update: [haskell-actions/setup](https://github.com/haskell-actions/setup).


Updates `haskell-actions/setup` from 2.12.0 to 2.12.1
- [Release notes](https://github.com/haskell-actions/setup/releases)
- [Commits](haskell-actions/setup@v2.12.0...v2.12.1)

---
updated-dependencies:
- dependency-name: haskell-actions/setup
  dependency-version: 2.12.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/casket-pages.yml

@@ -48,7 +48,7 @@ jobs:
 
       # Explicitly allowed by repository policy; actions.lock pins its commit.
       - name: Select tested Haskell toolchain
-        uses: haskell-actions/setup@v2.12.0
+        uses: haskell-actions/setup@v2.12.1
         with:
           ghc-version: '9.6.6'
           cabal-version: '3.10.3.0'