chore(workflows): use pnpm exce instead of npx

.github/workflows/playwright-test-workflow.yml

@@ -83,7 +83,7 @@ jobs:
         run: pnpm install
       - name: Install Playwright Browsers
         working-directory: ./tests/playwright
-        run: npx playwright install chromium --with-deps
+        run: pnpm exec playwright install --with-deps chromium
       - name: Wait for backend
         run: |
           while ! curl --output /dev/null --silent --head --fail http://localhost:8080; do