Bump haskell-actions/run-fourmolu from 11 to 12

Bumps [haskell-actions/run-fourmolu](https://github.com/haskell-actions/run-fourmolu) from 11 to 12.
- [Release notes](https://github.com/haskell-actions/run-fourmolu/releases)
- [Changelog](https://github.com/haskell-actions/run-fourmolu/blob/master/CHANGELOG.md)
- [Commits](haskell-actions/run-fourmolu@v11...v12)

---
updated-dependencies:
- dependency-name: haskell-actions/run-fourmolu
  dependency-version: '12'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/linters.yml

@@ -24,7 +24,7 @@ jobs:
       uses: actions/checkout@v6
 
     - name: 'Run fourmolu'
-      uses: haskell-actions/run-fourmolu@v11
+      uses: haskell-actions/run-fourmolu@v12
 
   hlint:
     runs-on: ubuntu-latest