Add pnpm-lock path

Author: aNNiMON

.github/workflows/docs.yml

@@ -21,6 +21,7 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
           cache: pnpm
+          cache-dependency-path: docs/pnpm-lock.yaml
       - name: Install dependencies
         run: cd docs && pnpm install