chore(workflows): node version in workflows to 16

Author: plumdumpling

.github/workflows/publish.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Setup npm
         uses: actions/setup-node@v2
         with:
-          node-version: "15"
+          node-version: "16"
           registry-url: "https://registry.npmjs.org"
       # npm cache folder is in ~/, not within the working directory
       - name: Cache npm directory

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup npm
         uses: actions/setup-node@v2
         with:
-          node-version: "15"
+          node-version: "16"
       # npm cache folder is in ~/, not within the working directory
       - name: Cache npm directory
         uses: actions/cache@v2