chore(node): add 18 to workflows and remove <16

Author: dpepin

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [ '12.x', '14.x', '16.x' ]
+        node: [ '16.x', '18.x' ]
     name: Node ${{ matrix.node }}
     steps:
     - uses: actions/checkout@v2