Make workflow test node version stable

.github/workflows/publish-dev.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Install Node, NPM and Yarn
         uses: actions/setup-node@v1
         with:
-          node-version: 15
+          node-version: '14.16.1'
 
       - name: Get yarn cache directory path
         id: yarn-cache-dir-path

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Install Node.js, NPM and Yarn
         uses: actions/setup-node@v1
         with:
-          node-version: 15
+          node-version: '14.16.1'
 
       - name: yarn install
         run: |