chore: downgrade Next.js in playwright open-next github workflow

Author: dario-piotrowicz

.github/workflows/playwright-cloudflare-open-next.yml

@@ -51,6 +51,12 @@ jobs:
       - name: Install packages
         run: pnpm install --frozen-lockfile
 
+      - name: Downgrade Next.js
+        # Open-next does not yet support next@15.4, so temporarily in order to have
+        # this workflow working we force install the latest Next.js 15.3 version instead
+        run: pnpm i next@15.3.2
+        working-directory: apps/site
+
       - name: Get Playwright version
         id: playwright-version
         working-directory: apps/site