Be explicit about Node version in GitHub CI

Even though Node v16 is the default
actions/runner-images#4446
be explicit about the version needed, because
future updates may break CI

.github/workflows/ci.yml

@@ -12,6 +12,9 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '16'
       - name: Install packages
         run: yarn install --frozen-lockfile
       - name: TypeScript compiler checks

.github/workflows/codeql-analysis.yml

@@ -37,6 +37,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
 
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '16'
+
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v1

.github/workflows/workflow.yml

@@ -10,6 +10,10 @@ jobs:
     steps:
       - uses: actions/checkout@master
 
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '16'
+
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v1
         with: