Bump haskell-actions/run-ormolu from 14 to 15

Bumps [haskell-actions/run-ormolu](https://github.com/haskell-actions/run-ormolu) from 14 to 15.
- [Release notes](https://github.com/haskell-actions/run-ormolu/releases)
- [Changelog](https://github.com/haskell-actions/run-ormolu/blob/master/CHANGELOG.md)
- [Commits](haskell-actions/run-ormolu@v14...v15)

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

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

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: haskell-actions/run-ormolu@v14
+      - uses: haskell-actions/run-ormolu@v15
   build:
     runs-on: ubuntu-latest
     needs: ormolu