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

Author: renovate[bot]

.github/workflows/CI.yml

@@ -24,7 +24,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v2
+      - uses: pnpm/action-setup@v4
         with:
           version: ${{ matrix.pnpm }}