ci: change npm version 15 for fibers

Author: thingsym

.github/workflows/lint.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '16'
+          node-version: '15'
 
       - name: Install Node.js package dependencies
         run: npm install

.github/workflows/npm-publish.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '16'
+          node-version: '15'
           registry-url: 'https://registry.npmjs.org'
           always-auth : true