chore: revert pnpm

Author: uetchy

.github/workflows/test.yml

@@ -20,6 +20,11 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
 
+      # needed for test
+      - uses: pnpm/action-setup@v2.1.0
+        with:
+          version: 6.0.2
+
       - name: Install dependencies
         run: yarn install