ci: Update corepack before enabling it (no-changelog) (#13004)

.github/workflows/ci-pull-requests.yml

@@ -17,11 +17,14 @@ jobs:
         with:
           ref: refs/pull/${{ github.event.pull_request.number }}/merge
 
-      - run: corepack enable
       - uses: useblacksmith/setup-node@v5
         with:
           node-version: 20.x
-          cache: pnpm
+
+      - name: Setup corepack and pnpm
+        run: |
+          npm i -g corepack@0.31
+          corepack enable
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile