Use pnpm/action-setup in Anchor CI instead of npm i -g pnpm

Author: mikemaccana

.github/workflows/anchor.yml

@@ -106,18 +106,20 @@ jobs:
       failed_projects: ${{ steps.set-failed.outputs.failed_projects }}
     steps:
       - uses: actions/checkout@v5
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10
       - uses: heyAyushh/setup-anchor@v4.999
         with:
           anchor-version: 0.32.1
           solana-cli-version: stable
-      - name: Display Versions and Install pnpm
+      - name: Display Versions
         run: |
           solana -V
           # it's okay to use --force in github action since all programs are tested in isolation
           solana-keygen new --no-bip39-passphrase --force
           rustc -V
           anchor -V
-          npm i -g pnpm
       - name: Build and Test
         env:
           TOTAL_PROJECTS: ${{ needs.changes.outputs.total_projects }}