chore: bumped node to v16 in github workflow

Author: lukester1975

.github/workflows/main.yml

@@ -12,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
-    - name: install node v12
+    - name: install node v16
       uses: actions/setup-node@v1
       with:
-        node-version: 12
+        node-version: 16
     - name: yarn install
       run: yarn install
     - name: tsc