feat: use run-fourmolu action in CI

.github/workflows/ghc.yml

@@ -26,23 +26,20 @@ jobs:
       - name: 📥 Checkout repository
         uses: actions/checkout@v4
 
+      - uses: haskell-actions/run-fourmolu@v9
+        if: matrix.os == 'ubuntu-latest'
+        with:
+          version: "0.14.0.0"
+          pattern: |
+            eo-phi-normalizer/**/*.hs
+            !eo-phi-normalizer/src/Language/EO/Phi/Syntax/**/*.hs
+            !eo-phi-normalizer/Setup.hs
+
       - name: 🧰 Setup Stack
         # FIXME use freckle/stack-action@v4 when https://github.com/freckle/stack-action/pull/31 is merged
         uses: deemp/stack-action@main
         with:
           fast: ${{ github.ref_name != 'master' }}
-
-      - name: Setup Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.10'
-          cache: 'pip'
-
-      - name: Check formatting
-        shell: bash
-        run: |
-          pip install -r requirements.txt
-          pre-commit run -c .pre-commit-checks.yaml fourmolu-check --all
 
       - uses: actions/setup-node@v4
         with:
@@ -54,7 +51,7 @@ jobs:
           java-version: 21
 
       - run: npm install -g [email protected]
-      
+
       - run: ./pipeline.sh
 
   haddock: