Simplify GitHub Actions workflow

.github/workflows/deploy.yml

@@ -19,15 +19,4 @@ jobs:
         run: composer install --prefer-dist --no-progress
 
       - name: Check PHP syntax
-        run: find . -type f -name '*.php' -print0 | xargs -0 -n1 php -l
-
-  notify:
-    needs: lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: Notify about deployment
-        if: success()
-        uses: rtCamp/action-slack-notify@v2
-        env:
-          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
-          SLACK_MESSAGE: 'Deployment triggered for ${{ github.ref_name }} branch'
+        run: find . -type f -name '*.php' -print0 | xargs -0 -n1 php -l