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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ jobs:
         uses: actions/setup-node@master
         with:
           node-version: ${{ matrix.node_version }}
-      - uses: pnpm/action-setup@v2
+      - uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4
         name: Install pnpm
         id: pnpm-install
         with: