chore(ci): update pnpm/action-setup@v4

Author: Kocal

.github/workflows/testing_apps.yml

@@ -96,7 +96,7 @@ jobs:
 
       -   if: ${{ contains(matrix.app.name, 'pnpm') }}
           name: Install pnpm
-          uses: pnpm/action-setup@v2
+          uses: pnpm/action-setup@v4
           with:
             version: 8.x