Updates pnpm/action-setup to v4 in ci workflow (#570)

Author: hiddenist

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           fetch-depth: 2
 
-      - uses: pnpm/action-setup@v2.2.4
+      - uses: pnpm/action-setup@v4
         with:
           version: 9.1.4