chore(deps): update pnpm/action-setup action to v4

Author: renovate[bot]

.github/actions/prepare/action.yml

@@ -10,7 +10,7 @@ name: Prepare
 
 runs:
   steps:
-    - uses: pnpm/action-setup@v2
+    - uses: pnpm/action-setup@v4
     - uses: actions/setup-node@v4
       with:
         cache: pnpm