Update tests to node 16 and 18

Author: julianmesa-gitkraken

.github/workflows/tests.yaml

@@ -47,7 +47,7 @@ jobs:
     name: "MacOS Tests"
     strategy:
         matrix:
-          node: [12, 14]
+          node: [16, 18]
     runs-on: macOS-latest
     steps:
       - uses: actions/checkout@v2
@@ -67,7 +67,7 @@ jobs:
     name: "Windows Tests"
     strategy:
         matrix:
-          node: [12, 14]
+          node: [16, 18]
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v2