chore: use the packageManager field from package.json in github action

This is the default behavior when the version is not specified, allowing to have the same version without updating it in two places.

.github/workflows/ci.yml

@@ -22,8 +22,6 @@ jobs:
     - uses: actions/checkout@v4
     - name: Install pnpm
       uses: pnpm/action-setup@v3.0.0
-      with:
-        version: 8.6.3
     - name: Use Node.js ${{ matrix.node }}
       uses: actions/setup-node@v4
       with: