Pin GH Actions to Node.js version to 16

Post 16 fails due to incompatibility with rollup-plugin-typescript2 v0.30

Author: igneel64

.github/workflows/publish.yaml

@@ -12,7 +12,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          registry-url: 'https://registry.npmjs.org'
+          registry-url: "https://registry.npmjs.org"
+          node-version: "16"
       - run: npm install
       - run: npm publish
         env:

.github/workflows/tests.yaml

@@ -13,6 +13,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
+        with:
+          node-version: "16"
       - run: npm install
       - run: npm run lint