Update NodeJS testing to the current LTS: v14 -> v16

Author: jasongrout

.github/workflows/packaging.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Install node
       uses: actions/setup-node@v1
       with:
-       node-version: '14.x'
+       node-version: '16.x'
     - name: Install Python
       uses: actions/setup-python@v2
       with:

.github/workflows/tests.yml

@@ -169,7 +169,7 @@ jobs:
     - name: Set up Node
       uses: actions/setup-node@v2
       with:
-        node-version: 14.x
+        node-version: '16.x'
 
     - name: Get yarn cache
       id: yarn-cache