chore(ci): update CI workflow to ensure consistent package management with pnpm

Author: dean-journeyapps

.github/workflows/ci.yml

@@ -9,13 +9,15 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v4      
       - uses: actions/setup-node@v4
         with:
           node-version: '18'
           cache: 'pnpm'
           check-latest: true
-          package-manager: 'pnpm'
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
       - name: Run linting
@@ -25,4 +27,4 @@ jobs:
       - name: Run tests
         run: pnpm test
       - name: Run build
-        run: pnpm run build
+        run: pnpm run build