chore: remove pnpm setup step from release workflow

.github/workflows/release-production.yml

@@ -28,15 +28,9 @@ jobs:
         with:
           latest: true
           prerelease: false
-      - uses: pnpm/action-setup@v4
-        name: Install pnpm
-        with:
-          version: latest
-          run_install: false
       - uses: actions/setup-node@v5
         with:
           node-version: 22
-          cache: 'pnpm'
       - run: |
           cat << 'EOF' > release-notes.txt
           ${{ steps.release-info.outputs.body }}