ci: pnpm cache install pnpm/exe when node16 (#8929)

ci: pnpm cache support node16

.github/actions/pnpm-cache/action.yml

@@ -25,10 +25,21 @@ runs:
         node-version: ${{ inputs.node-version }}
 
     - name: Enable corepack
+      if: ${{ inputs.node-version != '16' }}
       shell: bash
       run: |
         corepack enable
 
+    # https://pnpm.io/continuous-integration#github-actions
+    # Uses `packageManagement` field from package.json
+    - name: Install pnpm
+      uses: pnpm/action-setup@v4
+      if: ${{ inputs.node-version == '16' }}
+      with:
+        dest: ${{ runner.tool_cache }}/pnpm
+        # Use `@pnpm/exe` for Node 16
+        standalone: true
+
     - name: Get pnpm store directory
       id: pnpm-cache
       shell: bash