Fix Node.js cache path for docs subdirectory

Author: jeremyprime

.github/workflows/docs.yml

@@ -31,6 +31,7 @@ jobs:
         with:
           node-version: "20"
           cache: "npm"
+          cache-dependency-path: "docs/package-lock.json"
 
       - name: Setup JDK
         uses: actions/setup-java@v4