chore: update pnpm/action-setup action to v4

Author: renovate[bot]

.github/workflows/main.yml

@@ -29,7 +29,7 @@ jobs:
           node-version: 20
 
       - name: Install pnpm
-        uses: pnpm/action-setup@v3.0.0
+        uses: pnpm/action-setup@v4.0.0
         with:
           version: 8
           run_install: false