Drop Node.js v14 and add Node.js v20 in GitHub actions

Author: screendriver

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                node-version: [14, 16, 18]
+                node-version: [16, 18, 20]
         steps:
             - uses: actions/checkout@v3
             - name: Use Node.js v${{ matrix.node-version }}