fix typo in publish.yml

.github/workflows/publish.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Node
-      uses: actions/setup-=node@v2.4.1
+      uses: actions/setup-node@v2.4.1
       with: 
         node-version: 14
     - name: Install dependencies