ci: run pint and phpstan on the same commit

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -28,8 +28,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
-        with:
-          fetch-depth: 2
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -72,9 +70,6 @@ jobs:
       - name: Run Locale check
         run: node .github/workflows/static-analysis/locale/index.js
 
-      - run: git checkout HEAD^2
-        if: github.event_name == 'pull_request'
-
       - name: Run Pint
         run: composer format:check