chore(testing): remove node 14, add node 20 for github workflow tests (#193)

Author: Anemy

.github/workflows/unit-tests.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        node-version: [14.x, 16.x, 18.x]
+        node-version: [16.x, 18.x, 20.x]
     runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v2