Update pnpm/action-setup action to v4

Author: renovate[bot]

.github/actions/prepare/action.yml

@@ -14,7 +14,7 @@ runs:
       with:
         node-version: 18
 
-    - uses: pnpm/action-setup@v2.4.0
+    - uses: pnpm/action-setup@v4.0.0
       name: Install pnpm
       id: pnpm-install
       with: