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

Author: renovate[bot]

.github/workflows/CI.yml

@@ -25,7 +25,7 @@ jobs:
           node-version: 20
 
       - name: Setup PNPM
-        uses: pnpm/action-setup@v2
+        uses: pnpm/action-setup@v4
         with:
           version: 8
 
@@ -53,7 +53,7 @@ jobs:
           node-version: 20
 
       - name: Setup PNPM
-        uses: pnpm/action-setup@v2
+        uses: pnpm/action-setup@v4
         with:
           version: 8